From: Karl Cunningham Subject: Re: VBB feedback current Date: Tue, 30 Jun 1998 14:57:34 -0700 Sean-Thomas -- Thanks for all the information. I think I understand what you are saying about the feedback generating a current in the coil. It seems that if an amplifier has a low input impedance (to impersonate the impedance of the feedback coil), and if its output is a current from a high-impedance source (to impersonate the high impedance of the feedback components), I don't see why it wouldn't work. In other words, if one could place an ideal CURRENT amplifier in the line to the feedback coil, to magically boost the current to the coil while keeping everything else the same, would that not work? If so, then the problem is only to construct such a device. (And there are a lot of ways to connect up an op-amp). Since G of my new vertical will be about 4.7 (N/A-kg), I am planning to experiment with a current amplifier. And I am interested in methods to verify that the response is as desired. Please understand that I mean no disrespect, and I realize that you have a LOT more experience with seismic instrumentation than I do. But being one of those head-in-the-clouds engineer types who thinks that most of the world's problems can be solved with op-amps, I tend to question things I think I understand but don't make sense to me. (And I'd be even more of a pain if I were from Missouri ;). Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: Nuclear? tests? Date: Tue, 30 Jun 1998 17:34:36 -0700 (MST) On Tue, 30 Jun 1998, robert barns wrote: > Has solid evidence been presented that the Indian and/or Pakistani > "nuclear" tests were really nuclear events and not just large explosions of > conventional explosives? > Bob Barns Yes, they were nuclear. I am ashamed to admit that I can't remember who it was that posted some really cool EMPs recorded using some other device... ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ "Enlightenment is man's emergence from his self-imposed immaturity. Immaturity is the inability to use one's understanding without guidance from another. This immaturity is self-imposed when its cause lies not in lack of understanding, but in lack of resolve and courage to use it without guidance from another. Sapere Aude! "Have courage to use your own understanding!"- that is the motto of enlightenment. -Immanuel Kant: "An Answer to the Question: What is Enlightenment?" ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: S-G period and Q Date: Tue, 30 Jun 1998 18:09:25 -0700 Hi Ed That's the way I understand it also. Barry Edward Cranswick wrote: > > Barry- > Having been forced to examine textbooks ("Mechanics", Symon; "Physics", > Resnick & Halliday) from physics classes I failed, I think that your > statements below confirm my belief that the frequency of a simple pendulum is > independent of its mass for all angles. Please correct me if I am wrong. > -Edward > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: frankcnd@.......... (Frank Condon) Subject: Re: Nuclear? tests? Date: Tue, 30 Jun 1998 21:22:14 -0700 (PDT) Hi Guys: It was Charlie Plyler who captured those fantastic graphs with his ELF instrumentation. Yes, you can clearly see the EMP from the nuclear detonations. It is somewhat unclear as to how many indian tests were conducted from what is claimed. Frank Condon frankcnd@.......... "Located in the seismic corridor somewhere between Fontana & Mammoth Lakes" >On Tue, 30 Jun 1998, robert barns wrote: >> Has solid evidence been presented that the Indian and/or Pakistani >> "nuclear" tests were really nuclear events and not just large explosions of >> conventional explosives? >> Bob Barns > > Yes, they were nuclear. I am ashamed to admit that I can't remember who it >was that posted some really cool EMPs recorded using some other device... > >****************************************************************************** > > John Hernlund > E-mail: hernlund@....... > WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ > http://www.public.asu.edu/~hernlund/ > >"Enlightenment is man's emergence from his self-imposed immaturity. >Immaturity is the inability to use one's understanding without guidance from >another. This immaturity is self-imposed when its cause lies not in lack of >understanding, but in lack of resolve and courage to use it without guidance >from another. Sapere Aude! "Have courage to use your own understanding!"- >that is the motto of enlightenment. >-Immanuel Kant: "An Answer to the Question: What is Enlightenment?" > >****************************************************************************** > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Nuclear? tests? Date: Tue, 30 Jun 1998 21:50:48 -0700 Frank Condon wrote: > It was Charlie Plyler who captured those fantastic graphs with his ELF Unless he's an employee of the Pakistan government and he faked the images ;) Conspiracy theory anyone? Encrypting my hard disk right now, Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Walt Williams" Subject: SETI SOHO -- CNN Report Date: Tue, 30 Jun 1998 23:41:21 +0000 ------- Forwarded Message Follows ------- From: "Walt Williams" To: seti@....... Date: Mon, 29 Jun 1998 22:32:52 +0000 Subject: SETI SOHO -- CNN Report Hello All, On 06-29-98, CNN (TV news 'channel'), after announcing Peter Sturrock's SSE 'UFO' scientific panel review and report, reported that "controllers lost contact with the Solar and Heliospheric Observatory" (SOHO) spacecraft. See: http://www.foxnews.com:80/js_index.sml?content=/scitech/062998/lostsat ellite.sml For information on the SOHO spacecraft see: http://wholesun.nascom.nasa.gov/index-text.html Walt Williams _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: robert barns <75612.2635@..............> Subject: Re: Nuclear? tests? Date: Wed, 1 Jul 1998 11:46:37 -0400 Hi, I have little knowledge about the production of EMP by nuclear tests bu= t I'm wondering if tests, esp. such small ones, produce EMP detectable at long distances. If so, would it have been enough for Plyler to detect? The 26 June issue of Science mag. and the July issue of Physics Today (which arrived yesterday) have extensive and very interesting technical articles about the tests. They both discuss seismic data in detail and conclude that the data conflict with many of the Indian and Pakistani claims. Neither mentions EMP observations. Hurry down to your library and look these up. Physics Today has other info. of interest to seismologists. Bob Barns Wear short sleeves! Support your right to bare arms! = _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: robert barns <75612.2635@..............> Subject: Re: Nuclear? tests? Date: Wed, 1 Jul 1998 11:46:37 -0400 Hi, I have little knowledge about the production of EMP by nuclear tests bu= t I'm wondering if tests, esp. such small ones, produce EMP detectable at long distances. If so, would it have been enough for Plyler to detect? The 26 June issue of Science mag. and the July issue of Physics Today (which arrived yesterday) have extensive and very interesting technical articles about the tests. They both discuss seismic data in detail and conclude that the data conflict with many of the Indian and Pakistani claims. Neither mentions EMP observations. Hurry down to your library and look these up. Physics Today has other info. of interest to seismologists. Bob Barns Wear short sleeves! Support your right to bare arms! = _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: Nuclear? tests? Date: Wed, 01 Jul 1998 13:03:37 -0700 (MST) On Wed, 1 Jul 1998, robert barns wrote: > I have little knowledge about the production of EMP by nuclear tests but > I'm wondering if tests, esp. such small ones, produce EMP > detectable at long distances. Yes, they sure can... > If so, would it have been enough for Plyler to detect? I think so. The problem is how the pulse is going to find its way around the globe, i.e. how will it propagate... Many portions of the earth at great depth are far too conductive to allow short wavelength propagation (must be ultra-long period), so that leaves mainly ionospheric reflection for the vast majority of the energy, similar to the transmission of strong radio. Some frequencies from the pulse will probably not behave in this manner, but EMPs are a mess that always has a matching frequency. If I had that file of Charlie Plyer's I would be interested in looking at the fourier spectrum to see how low the frequencies reach... > Neither mentions EMP observations. EMP observations are probably too often forgot by the public, however I think that they are used a lot more than we know about...and they will not appear in scientific journals much because there isn't a whole lot of prospects for exploiting it scientifically... ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ "Enlightenment is man's emergence from his self-imposed immaturity. Immaturity is the inability to use one's understanding without guidance from another. This immaturity is self-imposed when its cause lies not in lack of understanding, but in lack of resolve and courage to use it without guidance from another. Sapere Aude! "Have courage to use your own understanding!"- that is the motto of enlightenment. -Immanuel Kant: "An Answer to the Question: What is Enlightenment?" ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Jim Hannon Subject: Re: Nuclear? tests? Date: Wed, 01 Jul 1998 19:31:13 -0500 John Hernlund wrote: > > EMP observations are probably too often forgot by the public, however I think > that they are used a lot more than we know about...and they will not appear in > scientific journals much because there isn't a whole lot of prospects for > exploiting it scientifically... > John, This is not exactly EMP but have you heard of project HAARP? A huge HF transmitter in Alaska that can beam energy up into the ionosphere to cause local heating of the ionosphere. By proper scanning of the HF beam they expect to be able to generate ELF waves in the ionosphere. One use of the generated ELF waves is imaging of underground features, Such as faults and nuclear test facilities. An experiment using naturally occuring ELF has imaged the tunnel in Texas for the defunct accelerator project. HAARP has generated huge amounts of protests against this supposed "directed energy weapon". -- Jim Hannon http://soli.inav.net/~jmhannon/ 42,11.90N 91,39.26W WB0TXL _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: Re: Nuclear? tests? Date: Thu, 02 Jul 1998 13:29:03 +1200 Yes Jim i know of it i recorded an excellect documentary about HAARP in late 1996 off the telly and as u say all about the out cries of a weapon weather control etc. very interesting all the same Dave >John, >This is not exactly EMP but have you heard of project HAARP? >A huge HF transmitter in Alaska that can beam energy up into the >ionosphere to cause local heating of the ionosphere. By proper scanning >of the HF beam they expect to be able to generate ELF waves in the >ionosphere. One use of the generated ELF waves is imaging of underground >features, Such as faults and nuclear test facilities. An experiment >using naturally occuring ELF has imaged the tunnel in Texas for the >defunct accelerator project. >HAARP has generated huge amounts of protests against this supposed >"directed energy weapon". >Jim Hannon Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., Green Is., Dunedin, South Is.. New Zealand. http://psn.quake.net/dave/home.htm IF there indeed are other parallel universes... I can now rest in the knowledge, that in at least one of them, I am filthy rich and drive a red Ferrari _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "frank murray" Subject: RE: (Fwd) SETI SOHO -- CNN Report Date: Wed, 1 Jul 1998 19:02:11 -0700 > On 06-29-98, CNN (TV news 'channel'), after announcing Peter > Sturrock's SSE 'UFO' scientific panel review and report, > reported that "controllers lost contact with the Solar and > Heliospheric Observatory" (SOHO) spacecraft. yes...the second major satellite to go bonkers, since folks started getting noisy about clinton sending satellite encryption and control tech to the chicoms...kinda looks like they're sending us a message... let's see now, how'd that intro on "the outer limits" go: "WE control the horizontal", "WE control the vertical"... frank _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: frankcnd@.......... (Frank Condon) Subject: Stovepipe Wells M4.7 Ubehebe Crater Date: Wed, 1 Jul 1998 23:31:49 -0700 (PDT) Hello All: What is your opinion about the recent seismic activity right near the old Ubehebe Crater in Death Valley? The depth was very shallow and seem to be epicentered very close to the crater. What is the historic record for the Ubehebe crater? Anything happened there over the past 500 years? Frank Condon frankcnd@.......... "Located in the Seismic Corridor Somewhere Between Fontana & Mammoth Lakes" _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: watson@................ (Charles Watson) Subject: New Mammoth EQ site Date: Wed, 01 Jul 1998 23:42:10 -0700 Fellow earthquake chasers, The Mammoth Times nespaper has asked me to put together a Seismo-Watch Earthquake Report for their web site. Before I submit it to them, I would like your comments to the following web page(s): http://www.seismo-watch.com/EQSERVICES/SeismoReports/MTSeismo/MTSeismo.html I know the graphics are a bit bulky and I will improve the bit density as time goes on. I also used a new jpg compaction method which seems to work well with my browser but I am unsure how it will work with others. Feel free to make some constructive comments and either post them here or send them to me directly. -- ---/---- Charles P. Watson, Consulting Geologist Advanced Geologic Exploration/Seismo-Watch P.O. Box 18012, Reno, Nevada 89511 Voice: 702-852-0992 / Fax: 702-852-3226 mailto:watson@................ http://www.seismo-watch.com _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: watson@................ (Charles Watson) Subject: Re: Stovepipe Wells M4.7 Ubehebe Crater Date: Thu, 02 Jul 1998 00:00:29 -0700 Yea, I saw that too, Frank. A number of years ago, I mapped some of the active faults along the Death Valley-Furnace Creek fault system. Pretty impressive. Multiple displacements along a wide zone. I forget, but I think the Ubehebe Crater is on the west for the Cottenwood Mountains. There is a promintory ridge that comes down from Tin Mountain and the crater is off the northwest side. The DV-FC fault is on the east side of Death Valley, a few miles east from the Ubehebe Crater. There are a bunch of springs along the fault trace and that's where Scottys Castle is. The epicenter for the M4.7 looks like it is southwest of Scottys Castle near the defunct(?) Mesquite Spring. Mayby it'll start flowing again, eh? Kinda erie since the northern portion of the DV-FC fault in Fish Lake Valley had that M5.1 and subsequence robust swarm. Max credable eq for the DV-FC fault is ~M8. EeeeK! -- ---/---- Charles P. Watson Seismo-Watch _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Walt Williams" Subject: The Sun Did It! Date: Thu, 2 Jul 1998 02:06:56 +0000 Frank, Please forgive me, this is off topic, one last time. The first satellite I could 'see' a possible link, whereas the SOHO is research craft which was built by the ESA and NASA to study the sun. If one were to visit the SEL archive at: gopher://proton.sec.noaa.gov:70/I9/plots/satenv/980627 gopher://proton.sec.noaa.gov:70/I9/plots/electron/980627 Maybe the sun fried it? Walt, 98.07.02 ============================================ ------- Forwarded Message Follows ------- From: "frank murray" To: "PSN-L Mailing List" Subject: RE: (Fwd) SETI SOHO -- CNN Report Date: Wed, 1 Jul 1998 19:02:11 -0700 Reply-to: PSN-L Mailing List > On 06-29-98, CNN (TV news 'channel'), after announcing Peter > Sturrock's SSE 'UFO' scientific panel review and report, > reported that "controllers lost contact with the Solar and > Heliospheric Observatory" (SOHO) spacecraft. yes...the second major satellite to go bonkers, since folks started getting noisy about clinton sending satellite encryption and control tech to the chicoms...kinda looks like they're sending us a message... let's see now, how'd that intro on "the outer limits" go: "WE control the horizontal", "WE control the vertical"... frank _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: watson@................ (Charles Watson) Subject: Re: The Sun Did It! Date: Thu, 02 Jul 1998 07:42:25 -0700 I received a Solar bulletin which said the craft was lost at 23:16 GMT 24 June. The anomalies on the GEOS Sat were on June 26. Pretty strong anomalies, though. -- ---/---- Charles P. Watson Seismo-Watch Walt Williams wrote: > > Frank, > > Please forgive me, this is off topic, one last time. > > The first satellite I could 'see' a possible link, whereas the SOHO > is research craft which was built by the ESA and NASA to > study the sun. If one were to visit the SEL archive at: > > gopher://proton.sec.noaa.gov:70/I9/plots/satenv/980627 > gopher://proton.sec.noaa.gov:70/I9/plots/electron/980627 > > Maybe the sun fried it? > > Walt, 98.07.02 > ============================================ > > ------- Forwarded Message Follows ------- > From: "frank murray" > To: "PSN-L Mailing List" > Subject: RE: (Fwd) SETI SOHO -- CNN Report > Date: Wed, 1 Jul 1998 19:02:11 -0700 > Reply-to: PSN-L Mailing List > > > On 06-29-98, CNN (TV news 'channel'), after announcing Peter > > Sturrock's SSE 'UFO' scientific panel review and report, > > reported that "controllers lost contact with the Solar and > > Heliospheric Observatory" (SOHO) spacecraft. > > yes...the second major satellite to go bonkers, since folks started > getting noisy about clinton sending satellite encryption and control > tech to the chicoms...kinda looks like they're sending us a message... > > let's see now, how'd that intro on "the outer limits" go: "WE control > the horizontal", "WE control the vertical"... > > frank > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "frank murray" Subject: RE: New Mammoth EQ site Date: Thu, 2 Jul 1998 09:38:19 -0700 hi charlie, well organized site...date is prominent, an item too often ignored...graphics are both pleasant to eye and info-rich...but one very slight problem: the depth chart gives the viewer the first impression that the recent series of quakes are within the caldera...i'm not sure that can be avoided without excessive section views or explanatory notes that would clutter up the site... good job, frank > Fellow earthquake chasers, > > The Mammoth Times nespaper has asked me to put together a Seismo-Watch > Earthquake Report for their web site. Before I submit it to them, I > would like your comments to the following web page(s): > http://www.seismo-watch.com/EQSERVICES/SeismoReports/MTSeismo/MTSeismo.html I know the graphics are a bit bulky and I will improve the bit density as time goes on. I also used a new jpg compaction method which seems to work well with my browser but I am unsure how it will work with others. Feel free to make some constructive comments and either post them here or send them to me directly. -- ---/---- Charles P. Watson, Consulting Geologist Advanced Geologic Exploration/Seismo-Watch P.O. Box 18012, Reno, Nevada 89511 Voice: 702-852-0992 / Fax: 702-852-3226 mailto:watson@................ http://www.seismo-watch.com _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "frank murray" Subject: RE: The Sun Did It! Date: Thu, 2 Jul 1998 09:56:08 -0700 walt wrote: > The first satellite I could 'see' a possible link, whereas the SOHO > is research craft which was built by the ESA and NASA to > study the sun. If one were to visit the SEL archive at: i agree that this is a bit off topic here, but on the other hand, earth watchers are likely to be decently informed on other matters of scientific interest...so i pose the question: anybody here know a source for info on the control of the SOHO??...specifically, were those same encryption algoritms used in it??... btw...i'd have thought that nasa would have hardened the craft to protect against the maximum reasonably expected sun blasts... frank _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: watson@................ (Charles Watson) Subject: Re: New Mammoth EQ site Date: Thu, 02 Jul 1998 10:03:56 -0700 Thanks for your comments, Frank. Yea, unsure how to make the activity in the Sierra terrain stand out differently than that in the caldera without a north-south x-section. maybe if I get a couple more sponsors, I can spend the extra time in making one. (hint-hint) Thanks again!! -- ---/---- Charlie Seismo-Watch _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: lahr@.................. Subject: IASPEI Web Site Date: Thu, 2 Jul 1998 13:25:24 -0600 (MDT) The International Association of Seismology and Physics of the Earth's Interior (IASPEI) home page, located at http://www.seismo.com/iaspei/ may have some items of interest to PSN members, although I have not checked it out in depth. JCLahr ################################## John C. Lahr ################################# Seismologist ################################ U.S. Geological Survey ############################### Geologic Hazards Team, MS966 ############################## PO Box 25046 #############################/############################## ############################/############################### Denver, Colorado 80225-0046 ################################ Phone: (303) 273-8596 ################################## Fax: (303) 273-8600 ################################### lahr@........ ##################################### http://giseis.alaska.edu/lahr http://lahr.org/john-jan _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Walt Williams" Subject: PSNL - Re: Nuclear? tests? - HAARP Date: Thu, 2 Jul 1998 15:59:35 +0000 Hello, FYI. Regarding HAARP, there is much blah, blah, blah, but here is some of the good stuff. High-frequency Active Auroral Research Program (HAARP). Cut to the chase: Data Index: http://www.haarp.alaska.edu/haarp/data.html My favorite data: http://server5550.itd.nrl.navy.mil/projects/haarp/rioData.html (The 98 data seems to have disappeared?) HAARP Diagnostic: http://server5550.itd.nrl.navy.mil/projects/haarp/haarpDiag.html and the Main page: http://server5550.itd.nrl.navy.mil/projects/haarp/index.html Walt, 98.07.02 p.s. I am still working the problems of my Lehman seismometer. Flexure is a problem, now I think I know why everybody went with the short plate and the bricks. ========================================================== ------- Forwarded Message Follows ------- Date: Thu, 02 Jul 1998 13:29:03 +1200 To: PSN-L Mailing List From: "David A. Nelson" Subject: Re: Nuclear? tests? Reply-to: PSN-L Mailing List Yes Jim i know of it i recorded an excellect documentary about HAARP in late 1996 off the telly and as u say all about the out cries of a weapon weather control etc. very interesting all the same Dave >John, >This is not exactly EMP but have you heard of project HAARP? >A huge HF transmitter in Alaska that can beam energy up into the >ionosphere to cause local heating of the ionosphere. By proper scanning >of the HF beam they expect to be able to generate ELF waves in the >ionosphere. One use of the generated ELF waves is imaging of underground >features, Such as faults and nuclear test facilities. An experiment >using naturally occuring ELF has imaged the tunnel in Texas for the >defunct accelerator project. >HAARP has generated huge amounts of protests against this supposed >"directed energy weapon". >Jim Hannon Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., Green Is., Dunedin, South Is.. New Zealand. http://psn.quake.net/dave/home.htm IF there indeed are other parallel universes... I can now rest in the knowledge, that in at least one of them, I am filthy rich and drive a red Ferrari _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: frankcnd@.......... (Frank Condon) Subject: Re: The Sun Did It! Date: Thu, 2 Jul 1998 16:59:25 -0700 (PDT) Hi Frank: Yeah, I think so too. That is a great possibility since we are having lots of CME's and proton streams headed towards us from the Sun. Thanks for the links! Unfortunately, I've heard that it will take a few years before they can replace it with another one. Frank >Frank, > >Please forgive me, this is off topic, one last time. > >The first satellite I could 'see' a possible link, whereas the SOHO >is research craft which was built by the ESA and NASA to >study the sun. If one were to visit the SEL archive at: > >gopher://proton.sec.noaa.gov:70/I9/plots/satenv/980627 >gopher://proton.sec.noaa.gov:70/I9/plots/electron/980627 > >Maybe the sun fried it? > >Walt, 98.07.02 >============================================ > > >------- Forwarded Message Follows ------- >From: "frank murray" >To: "PSN-L Mailing List" >Subject: RE: (Fwd) SETI SOHO -- CNN Report >Date: Wed, 1 Jul 1998 19:02:11 -0700 >Reply-to: PSN-L Mailing List > > > >> On 06-29-98, CNN (TV news 'channel'), after announcing Peter >> Sturrock's SSE 'UFO' scientific panel review and report, >> reported that "controllers lost contact with the Solar and >> Heliospheric Observatory" (SOHO) spacecraft. > >yes...the second major satellite to go bonkers, since folks started >getting noisy about clinton sending satellite encryption and control >tech to the chicoms...kinda looks like they're sending us a message... > >let's see now, how'd that intro on "the outer limits" go: "WE control >the horizontal", "WE control the vertical"... > >frank > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: VRDT calibration Date: Thu, 2 Jul 1998 19:59:57 -0500 (CDT) Meredith, You asked about calibrating the VRDT or displacement sensor for the VBB instrument, particularly the setup I use. It is quite basic, consisting of a heavy base plate to hold the fixed coils of the sensor, and a micrometer mounted so that the moving pin of the micrometer moves parallel to the baseplate. In reality, my baseplate is a large SS pressure cap from a deep ocean seis case, about 4" in diameter with a dozen holes drilled around the perimeter. I mount the coils frame of the VRDT in one of these holes. Then I use the mounting bracket of the micrometer to set it up so that it moves across the baseplate parallel to the VRDT frame, or at a right angle to the gap of the transducer. Then I use a strip of 1/4" wide by about 1/32" thick brass shim stock to attach the moving vane of the VRDT to the moving pin of the micrometer. The strip is simply wrapped in a tight short spiral around the 1/4" dia micrometer pin (actually, it is first wrapped around a thinner rod so it will fit tightly), with the free end turned 90 degrees and the ferrous vane attached (solder or epoxy) to it. By jointly pivoting the VRDT frame and the micrometer on the baseplate, they can be adjusted so that the vane fits perfectly centered in the VRDT coils gap and moves axially within it as the micrometer is turned. This is a case where a picture is worth ,......! But I think you can figure it out. I pre-set the vane position for a maximum positive output, then turn the micrometer in small increments (10 microns with the differential Mitutoyo unit I have) through zero to the maximum negative output. I do this at the PC, so I can log the numbers (voltage at each setting) as I do it. I reverse the procedure to repeat the data set. This results in the inverted V style plot of the web page. The slightly snakey appearance of the data wrt the straight line is due to the differential thread error of the micrometer for each revolution. A similar procedure can also be used with the SG capacitive sensor, but I would leave it assembled to the boom. The micrometer could be fastened to the base so that it pushes the boom or mass as it is turned, with a small rubber band making sure that constant contact is made. On the STM vertical, the micrometer can be fastened to the central support post such that it pushes up on the boom as it is turned. If you don't have a micrometer, the space between the boom and the support post can be filled with a stack of 0.001" shim stock strips until the VRDT output is at zero, then one strip at a time can be removed or added to calibrate the displacement transducer. You also asked about the pressure case for the STM. I did buy a 20 gallon terrarium and was fitting a reinforced acryllic lid to it with a feed-through for the electrical ribbon cable through the plastic frame. But the project is on hold because I was invited to show the STM seismometer to the IRIS Education and Outreach Committee at the IRIS workshop at Santa Cruz next week. So I decided to build three "neat and tidy" copies of the second prototype, and to take the better two, one as an assembled instrument, and another to show details of the individual parts. But the first task though was to complete the mechanical drawing of the complete instrument, which required taking all the dimensions from the Beta prototype and spending lots of time using CAD to make an accurate scaled drawing of the whole unit. I am making the three new units from the dimensional information of the drawing, which, of course, brings out all the errors so I can correct them. After I am done and all the corrections are made, I will post it on the web. It is accurate enough to be scaled up with a copier to full scale to make patterns for cutting and drilling. (I will put a 1/2 scale version in the SASE you sent several months ago.) And of course, improvements are still being made, like a modification of the spring suspension that allows quite long mechanical periods (over 20 seconds). Regards, Sean-THomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: EarthQuake Subject: Re: The Sun Did It! Date: Thu, 02 Jul 1998 19:03:09 -0700 At 04:59 PM 7/2/98 -0700, Frank Condon wrote: >Hi Frank: >Yeah, I think so too. That is a great possibility since we are having lots >of CME's and proton streams headed towards us from the Sun. Thanks for the >links! This has been ongoing for years.........so why is it now just coming up as a possibility? I and others have suggested that this may be science........probable...repeatable etc...........yet we continue to call the 'fringe' group of folks eccentric????? Hello? Good Morning! Of course Frank this is nothing personal...I jsust took it as a jumping off point for myown ventures.......Always appreciate your input! As well as most of Larry group. Bob PS Yes I know this is a group message! _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Walt Williams" Subject: PSN-L Re: The Sun Did It! Date: Thu, 2 Jul 1998 19:08:52 +0000 Charles, Thanks. Since I posted the e-letter to the PSN-L I have been in touch with a SOHO team member. They are hoping to regain control of the spacecraft; not looking too good. The sun as most already know has been quite anomalous, lately. Walt, 98.07.02 dfheli@.............. http://www.pacificnet.net/~dfheli ------- Forwarded Message Follows ------- Date: Thu, 02 Jul 1998 07:42:25 -0700 From: watson@................ (Charles Watson) Organization: Advanced Geologic Exploration / Seismo-Watch To: PSN-L Mailing List Subject: Re: The Sun Did It! Reply-to: PSN-L Mailing List I received a Solar bulletin which said the craft was lost at 23:16 GMT 24 June. The anomalies on the GEOS Sat were on June 26. Pretty strong anomalies, though. -- ---/---- Charles P. Watson Seismo-Watch Walt Williams wrote: > > Frank, > > Please forgive me, this is off topic, one last time. > > The first satellite I could 'see' a possible link, whereas the SOHO > is research craft which was built by the ESA and NASA to > study the sun. If one were to visit the SEL archive at: > > gopher://proton.sec.noaa.gov:70/I9/plots/satenv/980627 > gopher://proton.sec.noaa.gov:70/I9/plots/electron/980627 > > Maybe the sun fried it? > > Walt, 98.07.02 > ============================================ > > ------- Forwarded Message Follows ------- > From: "frank murray" > To: "PSN-L Mailing List" > Subject: RE: (Fwd) SETI SOHO -- CNN Report > Date: Wed, 1 Jul 1998 19:02:11 -0700 > Reply-to: PSN-L Mailing List > > > On 06-29-98, CNN (TV news 'channel'), after announcing Peter > > Sturrock's SSE 'UFO' scientific panel review and report, > > reported that "controllers lost contact with the Solar and > > Heliospheric Observatory" (SOHO) spacecraft. > > yes...the second major satellite to go bonkers, since folks started > getting noisy about clinton sending satellite encryption and control > tech to the chicoms...kinda looks like they're sending us a message... > > let's see now, how'd that intro on "the outer limits" go: "WE control > the horizontal", "WE control the vertical"... > > frank > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: New Mammoth EQ site Date: Thu, 02 Jul 1998 20:03:22 -0700 (MST) On Thu, 2 Jul 1998, Charles Watson wrote: > Thanks for your comments, Frank. Yea, unsure how to make the activity in > the Sierra terrain stand out differently than that in the caldera > without a north-south x-section. maybe if I get a couple more sponsors, > I can spend the extra time in making one. (hint-hint) Charles, Jonathan Lees at Yale has developed some cool software that makes viewing and constructing seismic activity cross-sections easy...you can download it from his page (I don't have the address right now but it shouldn't be difficult to find). ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ "Enlightenment is man's emergence from his self-imposed immaturity. Immaturity is the inability to use one's understanding without guidance from another. This immaturity is self-imposed when its cause lies not in lack of understanding, but in lack of resolve and courage to use it without guidance from another. Sapere Aude! "Have courage to use your own understanding!"- that is the motto of enlightenment. -Immanuel Kant: "An Answer to the Question: What is Enlightenment?" ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: STM-8 new spring suspension and etc. Date: Thu, 02 Jul 1998 23:13:30 -0600 Sean-Thomas, Thanks for the detailed reply about the vrdt calibration, it all sounds good and clear too me. On the terrarium pressure case, with the acrylic lid, I presume you plan to have the lid on top/vertical? Probably the case weight was a factor along with the structurally weaker lid and its atmospheric pressure distribution along the top rim, away from the seismo. May need an anti-slide mechanism for the adjusting screws on the glass? We'll be looking forward to the new drawings of the STM-8 on the web. Actually, I'am glad I didn't start on the beta prototype mechanically, as any changes will be in the drawing and I'd have been out of date. Will the spring suspension improvement of over 20 seconds, be incorporated into the drawing; or is it too new thus far? That would be really something.....over 20 seconds....wow! Of course you know you've got to get that "published" fast-ha. Curiosity....I presume it changes the flexures; and, is it more or less stable than the old design, or is it yet to be made, or any other data? So....with the + 20 seconds, does this extend the vbb range significantly from 600 seconds upwards too? Boom the same length? Hope the IRIS workshop (etc.) goes very well, and they bestow alot of notoriety to your very significant contributions. Of course, I hope its very enjoyable there too. Have a good trip. Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: frankcnd@.......... (Frank Condon) Subject: Re: New Mammoth EQ site Date: Thu, 2 Jul 1998 22:44:44 -0700 (PDT) Hello: Here is the URL for the software: http://love.geology.yale.edu/~lees/lees.html#lees.software Frank Condon frankcnd@.......... "Located in the seismic corridor somewhere between fontana & Mammoth Lakes" >On Thu, 2 Jul 1998, Charles Watson wrote: >> Thanks for your comments, Frank. Yea, unsure how to make the activity in >> the Sierra terrain stand out differently than that in the caldera >> without a north-south x-section. maybe if I get a couple more sponsors, >> I can spend the extra time in making one. (hint-hint) > >Charles, > Jonathan Lees at Yale has developed some cool software that makes viewing >and constructing seismic activity cross-sections easy...you can download it >from his page (I don't have the address right now but it shouldn't be >difficult to find). > >****************************************************************************** > > John Hernlund > E-mail: hernlund@....... > WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ > http://www.public.asu.edu/~hernlund/ > >"Enlightenment is man's emergence from his self-imposed immaturity. >Immaturity is the inability to use one's understanding without guidance from >another. This immaturity is self-imposed when its cause lies not in lack of >understanding, but in lack of resolve and courage to use it without guidance >from another. Sapere Aude! "Have courage to use your own understanding!"- >that is the motto of enlightenment. >-Immanuel Kant: "An Answer to the Question: What is Enlightenment?" > >****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: watson@................ (Charles Watson) Subject: Re: New Mammoth EQ site Date: Thu, 02 Jul 1998 23:36:59 -0700 Wooh-golly Frank! That's some mean 3-D GIS software! Now that I have had the chance to wipe the drool from my chin, I'll have to break out the ATM card and treat myself to a SUN Sparcstations running SUN OS-4.1.3. Gads! In my dreams! Hey, if you got another lying around, I'll pay the shipping. :> I'll keep the URL for when my ship does come in. Thanks! Nevertheless, I should show a N-S x-section. My modest Mac software can handle the data, it just takes time to generate it, which is a valuable commodity these days when there are other mountains to climb. Cheers! -- ---/---- Charlie Forever chained to a vintage Mac Performa. Frank Condon wrote: > > Hello: > Here is the URL for the software: > http://love.geology.yale.edu/~lees/lees.html#lees.software > > Frank Condon > frankcnd@.......... > "Located in the seismic corridor somewhere between fontana & Mammoth Lakes" > > >On Thu, 2 Jul 1998, Charles Watson wrote: > >> Thanks for your comments, Frank. Yea, unsure how to make the activity in > >> the Sierra terrain stand out differently than that in the caldera > >> without a north-south x-section. maybe if I get a couple more sponsors, > >> I can spend the extra time in making one. (hint-hint) > > > >Charles, > > Jonathan Lees at Yale has developed some cool software that makes viewing > >and constructing seismic activity cross-sections easy...you can download it > >from his page (I don't have the address right now but it shouldn't be > >difficult to find). > > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: New Mammoth EQ site Date: Fri, 03 Jul 1998 09:15:17 -0700 Charles Watson wrote: > Wooh-golly Frank! That's some mean 3-D GIS software! Now that I have had the > chance to wipe the drool from my chin, I'll have to break out the ATM card and > treat myself to a SUN Sparcstations running SUN OS-4.1.3. Gads! In my dreams! The documentation page says, "The source code will be available in the future for easy porting to any X11 UNIX environment." Which probably means that with some effort you could get it to run under Linux. I have no idea how difficult it would be and I'm not anxious to try, becuase I have no need for it, but if you really wanted it... Linux for the Mac is a lot cheaper than a Sun (even a used Sun). Worst case scenario you have to prod some other people into helping you compile it for Mac Linux and you need a little more RAM/HD space to run Linux and MacOS on the same computer. If not, I've seen used (remanufactured) Sun workstations and servers on the onsale web site for well under $10,000 ;) A $4,000 dual Pentium II would probably be just as fast but oh well. Just a thought, Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: angel Rodriguez Subject: Can this gizmo work? Date: Fri, 03 Jul 1998 12:36:22 -0400 Members of the list, I live and play in Panama (8,47 N by 82,41 W) and just lately have gotten interesed in this wonderful hobby. I have a vertical instrument that works well and am building several others. I keep time by reading the output of a handheld GPS. The other morning I made a gizmo and posted its photo on http://www.chiriqui.com/photo It's a 10k jpg. It's basically a horizontal device with a vertical pendulum but could easly be a Lehman type. The hinge is a piezo element that I took out of a broken phone. With my voltmeter I get quite a range of +- millivolt even with the slightest motion. My question is: Is this use of a piezo out to lunch? Has it been done and not proven useful? I don't want to waste my time, but if I can build useful cheap devices, why not. Any comment would be very welcome. Angel Rodriguez _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: watson@................ (Charles Watson) Subject: Re: New Mammoth EQ site Date: Fri, 03 Jul 1998 13:49:46 -0700 Thanks for the suggestions. I saw the line for Linux but had never known what it was. I would like to first upgrade my work station with a new Apple G-3 300 Mhz and from there expand back into the PC platform, with a UNIX machine operating all the core data retrevial and processing. As I have read here and elsewhere, I could really use a few operating systems around the office which are networked together. Come to think of it, I could really dream of some pretty neat setups. Got to start somewhere! My earthquake reporting busines is really at the critical state where I could really use some employees, but the finacial end of it hasn't caught up with it yet. I do all the the work, sometimes putting in 6-7 days a week 10-16 hours a day. I'll need to clone myself in order to get the work for free and make the extra money to aquire the hardware/software upgrades. Newspapers really don't have any money and making the eq reporting busines to work was really just a shot in the dark anyway. I like to do it but there is little financial reward doing the work. Been there, done that, eh? So after reaching the break point a year ago, I decided to make that jump. I submitted a proposal to NEHRP this year to see if they would assist in the financial go of it. Should know in a couple weeks if I was a successful canidate. I hope so. I see a lot I could do with more resources but more importantly, getting appropriately compensated for the work. If the proposal doesn't work out, then it's back to the drawing board and consider the losses. Charlie Seismo-Watch _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: New Mammoth EQ site Date: Fri, 03 Jul 1998 15:32:59 -0700 (MST) On Fri, 3 Jul 1998, Greg wrote: > Charles Watson wrote: > > Wooh-golly Frank! That's some mean 3-D GIS software! Now that I have had the > > chance to wipe the drool from my chin, I'll have to break out the ATM card and > > treat myself to a SUN Sparcstations running SUN OS-4.1.3. Gads! In my dreams! > The documentation page says, "The source code will be available in the > future for easy porting to any X11 UNIX environment." Which probably > means that with some effort you could get it to run under Linux. I have > no idea how difficult it would be and I'm not anxious to try, becuase I > have no need for it, but if you really wanted it... Linux for the Mac is > a lot cheaper than a Sun (even a used Sun). Worst case scenario you have > to prod some other people into helping you compile it for Mac Linux and > you need a little more RAM/HD space to run Linux and MacOS on the same > computer. Lees uses linux running some kind of xwindows platform for this program. ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ "Enlightenment is man's emergence from his self-imposed immaturity. Immaturity is the inability to use one's understanding without guidance from another. This immaturity is self-imposed when its cause lies not in lack of understanding, but in lack of resolve and courage to use it without guidance from another. Sapere Aude! "Have courage to use your own understanding!"- that is the motto of enlightenment. -Immanuel Kant: "An Answer to the Question: What is Enlightenment?" ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: frankcnd@.......... (Frank Condon) Subject: Re: New Mammoth EQ site Date: Fri, 3 Jul 1998 17:47:41 -0700 (PDT) Hi charlie: I guess it is a little way out there for the average user... I'm still using the freeware software authored by Dr. Alan Jones (SUNY)named "Seismic" on my PC for tracking events. It does 3d graphs, too. My favorite ones are the plots for the Northridge Earthquake & aftershocks. But, I have been known to use a defunct Delorme Windows program named "Map-Expert" (2d) for precise locations (One-step up from US Atlas). A new tool that I'm currently learning to use is Maptech's TopoScout for WIN95. But it's Not a 3d program and it gives elevation gains for hikers and burros. Sorry, I'm not sure if there is a MAC equivalent for any of these. BTW I own a Mac-Plus that is still used ocasionally. Frank... frankcnd@.......... "Located in the seismic corridor somewhere between Fontana & Mammoth Lakes" >Wooh-golly Frank! That's some mean 3-D GIS software! Now that I have had the >chance to wipe the drool from my chin, I'll have to break out the ATM card and >treat myself to a SUN Sparcstations running SUN OS-4.1.3. Gads! In my dreams! >Hey, if you got another lying around, I'll pay the shipping. :> > >I'll keep the URL for when my ship does come in. Thanks! > >Nevertheless, I should show a N-S x-section. My modest Mac software can handle >the data, it just takes time to generate it, which is a valuable commodity these >days when there are other mountains to climb. > >Cheers! > >-- >---/---- >Charlie >Forever chained to a vintage Mac Performa. > >Frank Condon wrote: >> >> Hello: >> Here is the URL for the software: >> http://love.geology.yale.edu/~lees/lees.html#lees.software >> >> Frank Condon >> frankcnd@.......... >> "Located in the seismic corridor somewhere between fontana & Mammoth Lakes" >> >> >On Thu, 2 Jul 1998, Charles Watson wrote: >> >> Thanks for your comments, Frank. Yea, unsure how to make the activity in >> >> the Sierra terrain stand out differently than that in the caldera >> >> without a north-south x-section. maybe if I get a couple more sponsors, >> >> I can spend the extra time in making one. (hint-hint) >> > >> >Charles, >> > Jonathan Lees at Yale has developed some cool software that makes viewing >> >and constructing seismic activity cross-sections easy...you can download it >> >from his page (I don't have the address right now but it shouldn't be >> >difficult to find). >> > >> > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: bob ogburn Subject: Re: Can this gizmo work? Date: Fri, 03 Jul 1998 19:57:42 -0700 Angel, I built several piezo sensors several years ago using elements from a product called a "flutter fan". The sensors were used to detect rapid vertical displacement (P waves) and they seemed to work well. I suspect the sensor you created will also be most useful for short period events due to the 'stiffness' of the hinge. bob ogburn Daly City, CA PSN angel Rodriguez wrote: > Members of the list, > > I live and play in Panama (8,47 N by 82,41 W) and just lately have gotten > interesed in this wonderful hobby. I have a vertical instrument that works > well and am building several others. I keep time by reading the output of a > handheld GPS. > > The other morning I made a gizmo and posted its photo on > http://www.chiriqui.com/photo It's a 10k jpg. > > It's basically a horizontal device with a vertical pendulum but could easly > be a Lehman type. The hinge is a piezo element that I took out of a broken > phone. With my voltmeter I get quite a range of +- millivolt even with the > slightest motion. My question is: Is this use of a piezo out to lunch? Has > it been done and not proven useful? I don't want to waste my time, but if I > can build useful cheap devices, why not. > > Any comment would be very welcome. > > Angel Rodriguez > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: watson@................ (Charles Watson) Subject: [Fwd: Re: Daily Summary of Solar Geophysical Activity for 27 June] Date: Sat, 04 Jul 1998 11:57:25 -0700 FYI -- ---/---- cpw From: "Walt Williams" Subject: A SOHO Status Report Date: Sat, 4 Jul 1998 12:45:02 +0000 Charles, Thank you. Walt Williams, 98.07.04 Best 4th to the USAers of the List =================================== Date sent: Sat, 04 Jul 1998 11:57:25 -0700 From: watson@................ (Charles Watson) Organization: Advanced Geologic Exploration / Seismo-Watch To: Subject: Daily Sum'ry of Solar Geophysical Activity for 27 June Send reply to: PSN-L Mailing List FYI -- ---/---- cpw ======================================================= ------- Forwarded Message Follows ------- From: Cary Oler Subject: Re: Daily Summary of Solar Geophysical Activity for 27 June To: watson@................ (Charles Watson) Date: Fri, 3 Jul 1998 16:17:16 -0600 (MDT) > What is the status of SOHO. > Did they get it back up and running? Not yet, but they're hopeful. I've appended below the status report that we provided with yesterdays daily summary of solar and geophysical activity (which you should receive in the next few hours - our system is busy sending out all of the older stuff and it may take a few hours to begin posting the recent material). Best regards. -Cary Oler Oler@.................. Oler@......... Oler@............... or COler@.................. SOHO SPACECRAFT UPDATE ---------------------- Controllers are still attempting to regain contact with the Solar and Heliospheric Observatory spacecraft. Contact was lost on 24 June during routine maintenance activities. There apparently were several emergency safe modes activated on the spacecraft prior to the loss of telemetry. Controllers now believe the spacecraft is tumbling in a spin mode that is preventing sunlight from reaching the solar panels sufficiently to charge the batteries to allow the spacecraft to transmit and receive ground commands. Fortunately, if this assessment is correct and if the assumed spin is correct, the orientation of the spacecraft to the Sun may change over the next few weeks to permit enough sunlight to charge the batteries and allow ground controllers to determine the problems and possibly regain control. In the meantime, a board is being convened to investigate the loss of contact in greater detail. European Space Agency ground stations in Europe have now joined the effort to help regain telemetry from the spacecraft. This is in addition to the Deep Space Network radio telescopes which have been trying since the incident occurred. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "frank murray" Subject: RE: [Fwd: Re: Daily Summary of Solar Geophysical Activity for 27 June] Date: Sat, 4 Jul 1998 13:13:46 -0700 charlie forwarded: >....................Contact was lost on 24 June during >routine maintenance activities. There apparently were >several emergency safe modes activated on the spacecraft >prior to the loss of telemetry................. hmmm...i'd like knowing more about those "emergency safe modes" and their activation...is this a reference to self protective routines that the bird was designed to go into when subjected to heavy sun blasts, to partial system failure, or to "illegal" communication attempts??...systems i've helped install at secure institutions typically go into "emergency safe modes" when any operator attempts to access levels of the system above that operator's authorization... if this is all too far off topic for this list, i'm open to private e-mail from any that might wander across further info on what happened to either the HALO or that geo-sychro bird... thanks again, charlie frank _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Keith Payea Subject: Parts Source Date: Sun, 5 Jul 1998 18:54:19 -0400 I've been considering the construction of one of Sean Thomas's vertical units, and I "re-discovered" a source for some of the parts, especially t= he brass shim stock. The outfit is "Small Parts, Inc.", 1-800-220-4242 139= 80 NW 58th Court, PO Box 4650, Miami Lakes, FL 33014-0650. They have all o= f the aluminum extrusion shapes, stainless hardware, and the troublesome sh= im stock in sizes from 0.001" to 0.031" thick. A 6" by 9" piece of the 0.00= 5" stock is only $3.69. They have a $15.00 minimum, but that won't be a problem once you see the catalog! They even have some titanium hardware like machine screws and 1/4-20 threaded rod. Good Luck, Keith Keith Payea Port Hadlock Design Group phdg@.............. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Parts Source Date: Sun, 05 Jul 1998 20:20:20 -0700 Keith Payea wrote: > brass shim stock. The outfit is "Small Parts, Inc.", 1-800-220-4242 13980 I spend too much time on the internet... I found the URL for those of us not planning on visiting the store anytime soon. Not that they probably wouldn't send a catalog in the mail. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Erich F. Kern" Subject: Re: Parts Source Date: Sun, 5 Jul 1998 20:53:51 -0700 Greg, I've no idea what you've just said. What does spending time on the internet have to do with Greg's post???? Erich > From: Greg > To: PSN-L Mailing List > Subject: Re: Parts Source > Date: Sunday, July 05, 1998 20:20 > > Keith Payea wrote: > > > brass shim stock. The outfit is "Small Parts, Inc.", 1-800-220-4242 13980 > > I spend too much time on the internet... I found the URL for those of us > not planning on visiting the store anytime soon. Not that they probably > wouldn't send a catalog in the mail. > > ,Greg > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Parts Source Date: Sun, 05 Jul 1998 21:10:53 -0700 Erich F. Kern wrote: > I've no idea what you've just said. What does spending time on the internet > have to do with Greg's post???? Not a lot really. I just happen to be online when the message arrived and I read through it and searched for the company and posted all in one session. In fact, I haven't hung up yet. By the way, I'm Greg and I was only criticizing myself. It's not the first time it's happened. A while ago someone posted info about an electronics surplus compnay from Scottsdale, AZ? and I found the URL for it as well. It's probably in the mailing list archive files. Also I think I may have found the URL for Gateway Electronics. I hope that makes more sense. I should really hang up now, Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Parts Source Date: Mon, 06 Jul 1998 10:19:58 -0700 Can I blame it on the internet as well? I was up too late? Not enough caffiene in my diet? Should have been dusting the furniture instead? http://www.smallparts.com/ http://www.gatewayelex.com/ Sorry, I forgot the name of the third one. And I didn't bookmark it. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: longer period of STM vertical Date: Mon, 6 Jul 1998 19:27:57 -0500 (CDT) Meredith, Regarding your questions about the longer period of the STM vertical. It turns out that the width and thickness of the original flexures of the leaf spring was limiting the mechanical period: ie. some of the rigidity of the spring ends was coupled into the system. In the BETA unit I had experimented and cut the lower flexures to 1/2" wide, and a 4 second period was obtainable as the upper spring support frame contact at the boom was moved toward the boom hinges. For the three new GAMMA units, I tried making the working width of both the upper and lower flexures only 1/4" wide (the soldering area is still 3/4" wide). Since the flexures are in tension, this is not a strength problem, but makes them easier to damage by excessive bending. THe thinner suspension further decouples the torques of the spring end as the boom moves and changes the angle of the spring restoring force. The period is adjusted by moving the upper spring support bar towards the hinges. A change of about 12 mm will vary the period from 2 seconds to infinity (ie. instability). Since the mechanical period affects the damping of the VBB system, the advantage of greater sensitivity or longer electronic period is traded off for a more stable mechanical period, like 6 to 10 seconds. There is still room for experimentation here. I am still packing up the new seismometers for the IRIS meeting at Santa Cruse, so I probably will not be able to post the new drawing of the seismometer until later in the month. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Home brew "speaker" magnetic enhancement Date: Mon, 06 Jul 1998 19:39:28 -0600 Hi all, If you're familar with speaker magnet construction, you might be interested in this approach of a homebrew speaker voice coil magnetic enhancement. Basically all speakers are shaped somewhat like a open ended can with a center pole welded inside on the bottom surface and extending up to a donut magnet with its space gap from the center post. Atop this is usually a donut shaped ferrite magnet. My unit has the same construction, but the only single change, was the addition of a neodymium magnet on the bottom of the container back plate. Then, the center post is sat on top of the neo. The strength of the 2 pole neo magnet is about 14K, while the ferrite donut magnet above is maybe less than 1K....depending on gap spacing. I plan on epoxying the center post to the magnet, but not to the back plate...this will allow movement for centering. The neo magnets power precludes any need for mechanical attachment. I do use a flat sheet metal backplate and a magnetic metal tube to extend the height of the assembly...which is normal. Of course the gap strength is really enhanced....maybe 5-10 times. No gaussmeter to check here though. The only interesting result other than the increased field I've seen, is that while normally the docut and center pole have equal attraction to metal, now; the neo takes over. So if you were to run a small screwdriver along the ferrite gap, it would stay there, but if you were to slightly space it from the ferrite the center pole would grab it. My Sprengnethers use the same basic construction. They are more adjustable than a store bought speaker unit. All parts can be dissassembled. My homebrew is of the same construction. The neodymium magnet I used is about 1/2" thick X 1" X 5/8" wide. Not a common size. I would expect that any 2 pole magnet of the neodymium (or Samarium) variety, would show a large field gap increase over just a plain ferrite gap. Obviously whether its used for a pickup or a feed back assembly, the sensitivity/power is increased for the coil....which is separate. My unit is not at a final stage. I will have to adopt to any coil and of the diameter of the center pole will also have to be found. If the above already exists somewhere...I don't know of it...yet-ha. Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: longer period of STM vertical Date: Mon, 06 Jul 1998 21:50:29 -0600 Sean-Thomas, Thanks for the reply on the longer period of your STM-Gamma unit. The period variation of 2 seconds too infinity really is fantastic for a vertical instrument! Well done Sean-Thomas! It almost sounds like with some electronic circuit and/or damping changes, it can attain long periods comparable too or over that of commercial units. Of course, I'am only guessing, but it would "seem" to be on the horizon. We'll be anxious to see the new drawings. Again, have a good time in Santa Cruz. Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: longer period of STM vertical Date: Mon, 06 Jul 1998 21:50:29 -0600 Sean-Thomas, Thanks for the reply on the longer period of your STM-Gamma unit. The period variation of 2 seconds too infinity really is fantastic for a vertical instrument! Well done Sean-Thomas! It almost sounds like with some electronic circuit and/or damping changes, it can attain long periods comparable too or over that of commercial units. Of course, I'am only guessing, but it would "seem" to be on the horizon. We'll be anxious to see the new drawings. Again, have a good time in Santa Cruz. Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Steve Hammond Subject: Status- Geosource MD-100 geophones Date: Mon, 06 Jul 1998 21:49:50 -0700 Electronics goldmine USA 1-800-445-0697 FAX 602-661-8259 Http://www.goldmine item # G9621 MD-100 geophone $8.95 each US I received my order over the weekend and everything is as expected. They are small and they work (I ordered 3) 14-hrz, 335 ohm coil, and appear to be used. I connected each up to the Lehman amp ciruit provided in the PSN documentation (Op27 configured with a gain of 221 and coax driver) and was pleased with the generated waveform. They look like they should work well for recording local events. I would have like to seen them shipped with the coil shorted however. I have installed one inplace of my one of my hs10's and will match the data to vertical and N/S to see how they perform in operation. Post the findings as I receive the data. Regards, Steve PSN San Jose _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Peter Subject: Geophone Date: Mon, 06 Jul 1998 23:04:14 -0700 I have been recording with one of the geophones from electronics gold mine. Its buried 2 feet deep in a paint can with sand and is quite sensitive. I pick up noise from a nearby construction site as well as a mystery event every 5:50am on week days only? Pete Fleming _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brian Subject: LPT:Analog? Date: Tue, 07 Jul 1998 02:33:27 -0400 Some time ago, a company called ADNAV Electronics, was selling a low cost A/D adapter that pluged in to the printer port. Does any one know if this is still available somewhere as the company appears to be out of business. It was called the LPT:Analog! v2.0 and sold for US$59.00. Thanx in advance! Brian. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Charlie Rond Subject: Event? Date: Tue, 07 Jul 1998 15:17:29 -0500 Something coming in at Memphis: 7/7/98 - 20:15uct. Charlie Rond -\/\--Public Seismic Network-Memphis http://gandlf.ceri.memphis.edu/~rond/psn _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ken Navarre Subject: Re: LPT:Analog? Date: Tue, 7 Jul 1998 13:26:48 -0700 (PDT) On Tue, 7 Jul 1998, Brian wrote: > Some time ago, a company called ADNAV Electronics, was selling a low > cost A/D adapter that pluged in to the printer port. Does any one know if > this is still available somewhere as the company appears to be out of > business. It was called the LPT:Analog! v2.0 and sold for US$59.00. I have one of these lttle goodies. One problem is that is unipolar. I shoved a "D" cell battery in series with it to "load" it so I could get the semblance of a +/- data trace. Another problem is that it isn't supported by either EMON or SDR. I had to write a Qbasic program to view the data and still haven't gotten it to save the data to a file... :( So much for a "simple" portable solution for a field unit using a laptop... I'll check to see if I have the address (email or snail) for these guys. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ken Navarre Subject: Re: LPT:Analog? Date: Tue, 7 Jul 1998 13:30:39 -0700 (PDT) Ah, here is the address for ADNAV. I had it tucked safely away in my bookmark file... David & Dorith Prutchi (409)292-0988 or mail (58 Chicory Ct, Lake Jackson,TX 77566) Ken _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: PSN - Adjustment Screws Source Date: Tue, 07 Jul 1998 18:14:23 -0400 After missing the cheap adjusting screws referred to in the past, I decided to use 1/4-28 screws. Last week I found a source of "relative" inexpensive adjustment screws. THORLABS, Inc sells 1/4-80 & 3/16-100 adjustment screws. These come in lengths from 1" to 3" with and without knobs. They also sell brass matching nuts. What is nice with these screws is that they have steel balls staked into the end of adjustment screws. By the way, the screws vary in price from $6 to $9 for 1/4 units and the nuts are in the $6 to $8 range. They accept MC, VISA, or AmEx THORLABS, INC. 435 Route 206, PO Box 366 Newton, NJ 07860-0366 973-579-7227 973-383-8406 (FAX) http://www.throlabs.com -- Rex Klopfenstein, Jr. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: Re: PSN - Adjustment Screws Source Date: Tue, 07 Jul 1998 19:16:36 -0400 Rex Klopfenstein, Jr. wrote: > > http://www.throlabs.com <----WRONG!!! The correct URL is http://www.thorlabs.com Sorry, my fingers got ahead of my brain!!! > > > -- > Rex Klopfenstein, Jr. > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: longer period of STM vertical Date: Tue, 07 Jul 1998 18:13:30 -0700 Sean Thomas Did moving the spring support closer reduce your mass much and consequently the gain. I'm sure there is a trade off in there, re. period vs gain. Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Al Allworth" Subject: A Y2K compliance test program Date: Thu, 9 Jul 1998 23:26:35 -0700 Hi All A Y2K compliance test program can be found at: The manual method may not tell the whole story. Al _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: RE: A Y2K compliance test program Date: Tue, 07 Jul 1998 23:54:14 -0700 >From: "Al Allworth" >To: "Larry Cochrane" >Subject: RE: A Y2K compliance test program >Date: Thu, 9 Jul 1998 23:39:19 -0700 >X-MSMail-Priority: Normal >X-Mailer: Microsoft Outlook 8.5, Build 4.71.2173.0 >Importance: Normal >X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3110.1 > > > >Hi all, > >Sorry, the url should be: www.nstl.com > > Al > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Francesco" Subject: LARGE EVENT NEAR AZORES ISLAND Date: Thu, 9 Jul 1998 17:19:51 +0200 05.19.07 UTC MB 6.1 Loc: ATLANTIC OCEAN - AZORES ISLAND 8 victims , many iniured e many material damnages I.ES.N. - PSN ITALY
05.19.07  UTC
MB 6.1
Loc: ATLANTIC OCEAN - AZORES = ISLAND
 
8 victims , many iniured e many = material=20 damnages
 
I.ES.N. - PSN ITALY
From: "Francesco" Subject: IRAN Date: Thu, 9 Jul 1998 17:26:17 +0200 14.18 UTC MB 6.0 Loc.: IRAN-ARMENIA-AZERBAIJAN BDR I.ES.N. - PSN ITALY
14.18  UTC
MB = 6.0
 
Loc.:  IRAN-ARMENIA-AZERBAIJAN BDR
 
I.ES.N. - PSN ITALY 
From: "David A. Nelson" Subject: LARGE Kermadec Sth PAC event Date: Fri, 10 Jul 1998 03:37:49 +1200 Hi all 15:30 utc, 9th july 98 and the surface waves are finally starting to die off S-P 3 minutes from Dunedin so event is jst Nth of the Kermadec Islands byeeeeeeee Dave Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., Green Is., Dunedin, South Is.. New Zealand. http://psn.quake.net/dave/home.htm IF there indeed are other parallel universes... I can now rest in the knowledge, that in at least one of them, I am filthy rich and drive a red Ferrari _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Good luck in Santa Cruz Date: Thu, 09 Jul 1998 13:05:04 -0600 Larry & Merredith- I agree with Meredith: Good luck in Santa Cruz. meredith lamb wrote: Again, have a good time in Santa Cruz. -Edward -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen & Kathy Subject: BOOMs Date: Fri, 10 Jul 1998 18:52:41 -0700 Is there anyone in the Northern California area that is recording any Sonic Booms????? Sinse the 12 of June I have recorded, on approx 10 occasions, usually between 17:00 and 19:00 UTC, a series of 7 to 8 and on one occasion 14 BOOMs!! They are approx 15 sec apart!! I've contacted all the quarrys, the sheriffs dept., the forestry dept., the fire dept., several heavy construction contracters and no one can account for them!!! I'm still trying to determine if it could be a local mine or if I am picking up Sonic Booms from Nevada???? The last set that I recorded was this evening starting at approx (July 11, 98 00:27:40),, (July 10, 98 17:27:43 local PDT) Thanks in advance, Stephen Mortensen PSN Station #55 Pilot Hill Ca USA _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Robert Avakian Subject: Re: BOOMs Date: Fri, 10 Jul 1998 20:28:40 -0700 I understand from relatives who live near Redding that there is an artillery or munitions base which shoots off rounds about that time. I even heard on or two this spring when I was there. Could this be what you are detecting? Avakian Stephen & Kathy wrote: > > Is there anyone in the Northern California area that is recording any > Sonic Booms????? Sinse the 12 of June I have recorded, on approx 10 > occasions, usually between 17:00 and 19:00 UTC, a series of 7 to 8 > and on one occasion 14 BOOMs!! They are approx 15 sec apart!! > I've contacted all the quarrys, the sheriffs dept., the forestry dept., > the fire dept., several heavy construction contracters and no one > can account for them!!! I'm still trying to determine if it could > be a local mine or if I am picking up Sonic Booms from Nevada???? > The last set that I recorded was this evening starting at approx > (July 11, 98 00:27:40),, (July 10, 98 17:27:43 local PDT) > Thanks in advance, > Stephen Mortensen > PSN Station #55 > Pilot Hill Ca USA > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: EarthQuake Subject: Re: BOOMs Date: Fri, 10 Jul 1998 19:14:42 -0700 At 06:52 PM 7/10/98 -0700, Stephen & Kathy wrote: >Is there anyone in the Northern California area that is recording any >Sonic Booms????? >The last set that I recorded was this evening starting at approx >(July 11, 98 00:27:40),, (July 10, 98 17:27:43 local PDT) >Thanks in advance, >Stephen Mortensen >PSN Station #55 >Pilot Hill Ca USA Stephen; A very interesting scenario. Although I am not a seimso owner, this AM as my kids were about ready to go to the aquatic center in Grand Forks BC., two major and I mean major sonic booms. First time I have heard them since I moved from Cleveland in 1976! These puppies were so huge they shook my one window open and almost rattled the big sunroom windows to shatters....First came one which got me right out of my seat..then another almost as you say about 10-15 seconds later. It took a bit but we knew what they were. FYI We live at apprx. 2100 ft in the Kettle Range at 48.9 N and I forget the Long but it is close to 118. The planes were flying together from N to S which means at that speed they had to cross over from Canada! The birds came RIGHT over our octagon cabin and the noise etc...really blew us away! Bob Shannon Pinpoint EQ News _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: EarthQuake Subject: Re: BOOMs Date: Fri, 10 Jul 1998 19:33:42 -0700 At 06:52 PM 7/10/98 -0700, Stephen & Kathy wrote: >Is there anyone in the Northern California area that is recording any >Sonic Booms????? Stephen; Could you please cross-post your original on this to my list? Pinpoint@.............. Thanks Bob _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Peter Subject: Missing Quake? Date: Fri, 10 Jul 1998 19:43:54 -0700 PSN, There was a quake on the usgs page: http://quake.wr.usgs.gov/recenteqs/ It was listed as a M4.1 at about 19:18:50 (the time it arrived here) on 7/8/98. The location was just off the coast of southern CA. The map showed it as a red box so it happened within the hour and should have been on the map for 7 days? Now its gone? I think I recorded it here in San Jose on my Lehman. I would not have noticed it was gone until a friend mentioned its disappearance? Anyone know what it was or why it is gone? Thanks, Pete Fleming _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "John Krempasky" Subject: Re: Missing Quake? Date: Fri, 10 Jul 1998 22:51:02 -0400 Here's a copied section of a post from Lucy Jones of the USGS found on ca.earthquakes on USENET: A similar thing happened with the "M4.2" off San Diego. It was really a M4.8 off Baja, but with no stations nearby the automatic system mislocated it. Lucy Jones USGS/Caltech - Southern California Seismic Network speaking for myself So, it was a mislocated quake by an automatic system. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen & Kathy Subject: Re: BOOMs Date: Fri, 10 Jul 1998 19:54:15 -0700 Robert Avakian wrote: > > I understand from relatives who live near Redding that there is an > artillery or munitions base which shoots off rounds about that time. I > even heard on or two this spring when I was there. Could this be what > you are detecting? > > Avakian > > Stephen & Kathy wrote: > > > > Is there anyone in the Northern California area that is recording any > > Sonic Booms????? Sinse the 12 of June I have recorded, on approx 10 > > occasions, usually between 17:00 and 19:00 UTC, a series of 7 to 8 > > and on one occasion 14 BOOMs!! They are approx 15 sec apart!! > > I've contacted all the quarrys, the sheriffs dept., the forestry dept., > > the fire dept., several heavy construction contracters and no one > > can account for them!!! I'm still trying to determine if it could > > be a local mine or if I am picking up Sonic Booms from Nevada???? > > The last set that I recorded was this evening starting at approx > > (July 11, 98 00:27:40),, (July 10, 98 17:27:43 local PDT) > > Thanks in advance, > > Stephen Mortensen > > PSN Station #55 > > Pilot Hill Ca USA At this point it could be most anything!! If no one else is recording them, then I will go back to looking for something local. If anyone needs more specific times I can give them!! Thanks for the reply, Stephen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: EarthQuake Subject: Re: BOOMs Date: Fri, 10 Jul 1998 20:22:15 -0700 At 07:54 PM 7/10/98 -0700, Stephen & Kathy wrote: >At this point it could be most anything!! If no one else is recording >them >then I will go back to looking for something local. If anyone needs >more >specific times I can give them!! FYI My times are not specific but my wife did make mental notes, as it was such an unusual occurence. Between 11:30AM and 12:15PM PCT. I thought this was a no-no....sonic stuff over populated areas.... I realize Larry attempts and succeeds at keeping this a very focused group, but I think those who have had this happen in the past few days may find it at least indirectly related. Bob Pinpioint _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Arie Verveer Subject: One Degree ? Date: Sat, 11 Jul 1998 18:47:05 +0800 Hi, I plan to generate a Travel time table for West Australia that can be used with Winquake. I'll be using a set of tables given to me by the local geophysical observatory. (time verses distance.) But the tables used by Winquake are in degrees verses time. The question is: What is a degree? Is a degree based on the geoid height or do you need to compensate for the shape of the earth? Any help would be appreciated. Arie _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Kermadec Islands Quake Lr-Lq Attenuation Date: Mon, 13 Jul 1998 09:04:29 -0600 Hi All, Am questioning the Kermadec Islands 6.3 quake of 7/9/98, which occurred at 14:45:26. Why do all the records from many amateur sources have such large P & S traces, and the LR-LQ traces have such low amplitudes? Even the records of instruments of longer period (~15 seconds up), show little amplitude. It occurred at normal depth. Alot of quakes around other ocean areas are not so affected. Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: Re: Kermadec Islands Quake Lr-Lq Attenuation Date: Tue, 14 Jul 1998 07:30:02 +1200 At 09:04 AM 7/13/98 -0600, you wrote: >Hi All, >Am questioning the Kermadec Islands 6.3 quake of 7/9/98, which >occurred at 14:45:26. Why do all the records from many amateur >sources have such large P & S traces, and the LR-LQ traces have >such low amplitudes? Even the records of instruments of longer >period (~15 seconds up), show little amplitude. It occurred at >normal depth. Alot of quakes around other ocean areas are not so >affected. >Thanks, Meredith Lamb Thats easy meredith, cuz the quake was not nornal depth its was ~250 km deep, the NEIC record for this event was well out, the New Zealand seismological observatory with many closer in recorders, got a far more accurate location and depth calculation here is their info which is a far better fit to the data U.T.: 1998 July 9 14:45:57 NZST: 1998 July 10 2:45:57 a.m. Lat, Long: 32.05S 176.39W Location: 341 km south-south-east of Raoul Island Focal depth: 250 km Magnitude: ML 6.5 U will also notice that there is a huge difference in location as well... 2 degrees (222km) further south and 3 degrees (333km) further west than the NEIC records. It was only when I got this data did my P and S arrivals make sense cuz I could see that the quake was somewhat closer to me that the NEIC indicated. The real problem lies in that they (NEIC) have only a few stations is this part of the world and as a result their locations, etc are often a long way out. They often locate events off shore of NZ that are really in the centre of either the North or South Island. Congrats. on ur noticing of the lack of large surface waves for such a sizeable event (Mw7.2) when I sat in front of my SDR and drum recorders and watched this event roll in, I also noted the low amplitude of the surface waves and said to myself hmmmmm a deep quake ! Take care Dave Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., Green Is., Dunedin, South Is.. New Zealand. http://psn.quake.net/dave/home.htm IF there indeed are other parallel universes... I can now rest in the knowledge, that in at least one of them, I am filthy rich and drive a red Ferrari _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen & Kathy Subject: major quake Date: Tue, 14 Jul 1998 21:57:16 -0700 Major Quake as I type Stephen Pilot Hill Ca USA _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen & Kathy Subject: second smaller quake Date: Tue, 14 Jul 1998 22:00:28 -0700 A second smaller quake is rolling through Stephen Pilot Hill Ca _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Steve Hammond Subject: Re: second smaller quake Date: Tue, 14 Jul 1998 21:39:54 -0700 Tom's place 5.1 http://quake.usgs.gov/recenteqs/Maps/119-38.html Regards, Steve Hammond Stephen & Kathy wrote: > > A second smaller quake is rolling through > Stephen > Pilot Hill Ca > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen & Kathy Subject: quake 3 Date: Tue, 14 Jul 1998 23:50:07 -0700 another small quake,,, probably about a 3.7 or 3.8 going off!! Stephen Pilot Hill _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen & Kathy Subject: quake 4 Date: Tue, 14 Jul 1998 23:54:16 -0700 And another one about the same size! Stephen Pilot Hill _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Canie Brooks Subject: Re: quake 3 Date: Tue, 14 Jul 1998 23:53:37 -0700 At 11:50 PM 7/14/98 -0700, Stephen & Kathy wrote: >another small quake,,, probably about a 3.7 or 3.8 going off!! >Stephen >Pilot Hill Here it is! == PRELIMINARY EARTHQUAKE REPORT == Rapid Earthquake Location Service U.S. Geological Survey, Menlo Park, California U.C. Berkeley Seismological Laboratory, Berkeley, California Version 2: Updates lower and earlier versions of this earthquake report This is a computer-generated message -- it has not yet been reviewed by a seismologist. A LIGHT EARTHQUAKE OCCURRED AT 11:46 PM PDT Tuesday, Jul 14, 1998. THE MAGNITUDE 4.1 (ML) EVENT IS LOCATED 7 MILES WSW OF TOMS PLACE, CA THE HYPOCENTRAL DEPTH IS 3.1 MILES. PRINCIPAL EARTHQUAKE PARAMETERS _______________________________ Magnitude : 4.07 ML Event Date & Time : 07/14/1998 11:46:32 PM PDT 07/15/1998 06:46:32 UTC Location : 37.5345 N, 118.8125 W : (37 deg. 32.07 min. N, 118 deg. 48.75 min. W) Depth : 5.0 km. deep ( 3.1 miles) Location Quality : Good 12 km ( 7 miles) WSW (256 degrees) of Toms Place, CA 19 km ( 12 miles) SE (132 degrees) of Mammoth Lakes, CA 42 km ( 26 miles) WNW (297 degrees) of Bishop, CA 54 km ( 34 miles) SSE (150 degrees) of Lee Vining, CA 62 km ( 38 miles) NW (312 degrees) of Big Pine, CA ADDITIONAL EARTHQUAKE PARAMETERS ________________________________ number of phases : 160 rms misfit : 0.06 seconds horizontal location error : 0.2 km vertical location error : 0.6 km maximum azimuthal gap : 109 degrees distance to nearest station : 6. km In region 2 (098) MT. MORRISON (RSM) event ID: 51058350 ========================================================================== > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Canie Brooks Subject: Re: quake 4 Date: Tue, 14 Jul 1998 23:57:38 -0700 At 11:54 PM 7/14/98 -0700, Stephen & Kathy wrote: >And another one about the same size! >Stephen >Pilot Hill Must be this one: == PRELIMINARY EARTHQUAKE REPORT == Rapid Earthquake Location Service U.S. Geological Survey, Menlo Park, California U.C. Berkeley Seismological Laboratory, Berkeley, California Version 2: Updates lower and earlier versions of this earthquake report This is a computer-generated message -- it has not yet been reviewed by a seismologist. A MINOR EARTHQUAKE OCCURRED AT 11:50 PM PDT Tuesday, Jul 14, 1998. THE MAGNITUDE 3.7 (ML) EVENT IS LOCATED 3 MILES E OF MAMMOTH LAKES, CA THE HYPOCENTRAL DEPTH IS 4.8 MILES. PRINCIPAL EARTHQUAKE PARAMETERS _______________________________ Magnitude : 3.69 ML Event Date & Time : 07/14/1998 11:50:56 PM PDT 07/15/1998 06:50:56 UTC Location : 37.6433 N, 118.9120 W : (37 deg. 38.60 min. N, 118 deg. 54.72 min. W) Depth : 7.8 km. deep ( 4.8 miles) Location Quality : Excellent 5 km ( 3 miles) E ( 96 degrees) of Mammoth Lakes, CA 22 km ( 14 miles) WNW (294 degrees) of Toms Place, CA 40 km ( 25 miles) SSE (152 degrees) of Lee Vining, CA 55 km ( 34 miles) NW (304 degrees) of Bishop, CA 61 km ( 38 miles) E (100 degrees) of Yosemite Village, CA ADDITIONAL EARTHQUAKE PARAMETERS ________________________________ number of phases : 142 rms misfit : 0.09 seconds horizontal location error : 0.3 km vertical location error : 0.4 km maximum azimuthal gap : 42 degrees distance to nearest station : 1. km In region 2 (090) SOUTH MOAT (LVC) event ID: 51058352 ========================================================================== > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Fred S Subject: Re: quake 4 Date: Wed, 15 Jul 1998 17:34:04 -0700 Is it really nessecary to RE-post all the USGS reports. Seems to me anyone on this email list has web access. Just an observation as I compress my mail folder. Fred -- Gravity: It's not just a good idea. It's the LAW ! _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: [Fwd: Re: AFTERSHOCK FORECAST] Date: Wed, 15 Jul 1998 18:52:19 -0600 Dave- The message was not sent to the Public Seismic Network (PSN), but I got my first notification of the Mammoth lakes activity from the 7 messages that PSN members posted within the first couple of hours of the quake, starting with: > Subject: > major quake > Date: > Tue, 14 Jul 1998 21:57:16 -0700 > From: > Stephen & Kathy > Reply-To: > PSN-L Mailing List > To: > PinpointEQ@........... > CC: > psn-l@............. > > > > > Major Quake as I type > Stephen > Pilot Hill Ca USA > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L > and including: > Subject: > Re: second smaller quake > Date: > Tue, 14 Jul 1998 21:39:54 -0700 > From: > Steve Hammond > Reply-To: > PSN-L Mailing List > To: > PSN-L Mailing List > References: > 1 > > > > > Tom's place 5.1 > > http://quake.usgs.gov/recenteqs/Maps/119-38.html > > Regards, Steve Hammond > > Stephen & Kathy wrote: > > > > A second smaller quake is rolling through > > Stephen > > Pilot Hill Ca > > > > _____________________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email listserver@............. with the body of the > > message: leave PSN-L > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L > > Subject: Re: AFTERSHOCK FORECAST > Date: Wed, 15 Jul 98 11:32:54 PDT > From: oppen@................ (David Oppenheimer) > To: bakun@.................... djackson@......... edward_Bortugno@........... > hfmengeo@...................... brune@............... > jdieterich@................... mori@......... > kmcnally@................. jones@....................... > reasen@.................... Rich_Eisner@........... dschwartz@......... > sieh@....................... tcasadev@................... > jdavis@.............. barbara@.................... > lind@.................... pjorgenson@......... dacox@......... > jfilson@......... cnss-list@........ beepers@.................... > warning_center@........... oppen@................... > > The NCSN/BDSN issued its first aftershock probability statement in > response to the M5.1 at Mammoth last evening. The message was issued > ~12 minutes after the mainshock. The message was sent to CA OES for > rebroadcast via their EDIS system to the wire services and was also > posted on the WWW. You can view the latter at the very bottom of the > text page for the mainshock at > > http://quake.wr.usgs.gov/recenteqs/Quakes/nc51058271.html > > So far, there have been no inquiries about the statement to either the > USGS or CA OES. Perhaps the lack of media interest was the routine > occurrence of big events at Mammoth ?? > > -David -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". Dave-
    The message was not sent to the Public Seismic Network (PSN), but I got my first notification of the Mammoth lakes activity from the 7 messages that PSN members posted within the first couple of hours of the quake, starting with: 
Subject: 
          major quake
     Date: 
          Tue, 14 Jul 1998 21:57:16 -0700
     From: 
          Stephen & Kathy 
 Reply-To: 
          PSN-L Mailing List 
       To: 
          PinpointEQ@...........
      CC: 
          psn-l@.............




Major Quake as I type
Stephen
Pilot Hill Ca USA

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and including:
  

Subject: 
            Re: second smaller quake
       Date: 
            Tue, 14 Jul 1998 21:39:54 -0700
      From: 
            Steve Hammond 
   Reply-To: 
            PSN-L Mailing List 
        To: 
            PSN-L Mailing List 
 References: 
            1




Tom's place 5.1 

http://quake.usgs.gov/recenteqs/Maps/119-38.html

Regards, Steve Hammond

Stephen & Kathy wrote:
> 
> A second smaller quake is rolling through
> Stephen
> Pilot Hill Ca
> 
> _____________________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email listserver@............. with the body of the
> message: leave PSN-L

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Subject: Re: AFTERSHOCK FORECAST

Date: Wed, 15 Jul 98 11:32:54 PDT

From: oppen@................ (David Oppenheimer)

To: bakun@.................... djackson@......... edward_Bortugno@...........

     hfmengeo@...................... brune@...............

     jdieterich@................... mori@.........

     kmcnally@................. jones@.......................

     reasen@.................... Rich_Eisner@...........
dschwartz@.........

     sieh@....................... tcasadev@...................

     jdavis@.............. barbara@....................

     lind@.................... pjorgenson@.........
dacox@.........

     jfilson@......... cnss-list@........ beepers@....................

     warning_center@........... oppen@...................


The NCSN/BDSN issued its first aftershock probability statement in

response to the M5.1 at Mammoth last evening.  The message was
issued

~12 minutes after the mainshock.  The message was sent to CA OES
for

rebroadcast via their EDIS system to the wire services and was also

posted on the WWW.  You can view the latter at the very bottom
of the

text page for the mainshock at


http://quake.wr.usgs.gov/recenteqs/Quakes/nc51058271.htm
l


So far, there have been no inquiries about the statement to either the

USGS or CA OES.  Perhaps the lack of media interest was the routine

occurrence of big events at Mammoth ??


-David

 

--

Edward Cranswick               
Tel: 303-273-8609

US Geological Survey, MS 966    Fax: 303-273-8600

PO Box 25046, Federal Center    cranswick@........

Denver, CO 80225-0046  USA      E.M.
Forster said, "Only connect".

 

From: Arie Verveer 
Subject: Re: Kermadec Lr-Lq Attenuation
Date: Thu, 16 Jul 1998 01:26:00 +0800

Hi Meredith,


> Am questioning the Kermadec Islands 6.3 quake of 7/9/98, which
> occurred at 14:45:26.  Why do all the records from many amateur
> sources have such large P & S traces, and the LR-LQ traces have
> such low amplitudes?

In my case I'm using a high and low frequency output from theseismometer
electronics.  I generally post the high frequency
output "AU1" + "AU3" and rarely post the low frequency "AU2"
and"AU4".  The low frequency gives a nice display on the LR-LQ
waves. Maybe I should post both on a big event?

Regards

Arie




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Public Seismic Network Mailing List (PSN-L)


From: EARTHQUAKE REPORTING 
Subject: Re: [Fwd: Re: AFTERSHOCK FORECAST]
Date: Wed, 15 Jul 1998 18:46:28 -0700

At 06:52 PM 7/15/01 -0600, Edward Cranswick wrote:
>Dave-
>    The message was not sent to the Public Seismic Network (PSN), but I
got my
>first notification of the Mammoth lakes activity from the 7 messages that PSN
>members posted within the first couple of hours of the quake, starting with:

Ed etal;
The problem is net-wide and concerns both DNS lookups as well as a buried
COBAL error that has been lurking. This problem is causing multiple sends
amongst other major problems. I addressed this problem to CERN 6 weeks ago
but received no response.....BTW..It is my impression as a long time (34
years) programmer that this is another in a series of problems that will
come as a hidden scenario in this Y2K stupidity.....sort of a nested
problem but we have so many "experts" out there that nobody wants to listen
to simple logic!
Bob Shannon
Pinpoint Since 2001:->


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Public Seismic Network Mailing List (PSN-L)


From: 
Subject: Re:  {EarthWaves} Re: quake  4
Date: Wed, 15 Jul 1998 22:39:18 EDT

Uh.... Fred?

We got the message -- three times. Looks like your server is hiccuping again.

:) 

Adrienne

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From: meredith lamb 
Subject: SG Electronics
Date: Wed, 15 Jul 1998 21:32:53 -0600

Hi Arie,

I'd be interested in seeing your low frequency event files
for the bigger events.  Am amazed by what I've seen in the past
for the SG response.  Your seismo is the smallest I've seen,
but it sure seems to work well for near and far quakes.

Guess I have more of a long period seismo interest. 

Do have a question.....is your electronics basically the same as
per the PSN schematic, or...is it different, or is it Larry Cochranes
commercial amplifier model?

Thanks, Meredith Lamb


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Public Seismic Network Mailing List (PSN-L)


From: Karl Cunningham 
Subject: Tiltmeter Concept
Date: Thu, 16 Jul 1998 08:45:15 -0700

Greetings --

An item crossed my desk at work that has been patented (Pat no 5,632,093),
that is a tiltmeter design I hadn't seen before.  It contains an
arrangement of coils similar to that of an LVDT, but instead of having a
moving core it is partially submerged in a ferromagnetic fluid.  This fluid
provides the magnetic coupling from primary to the secondaries.  As the
apparatus is tilted (or accelerated), the fluid covers more of one
secondary and less of the other, and causes an imbalance in the output of
the pickup coils.

Cute idea.  Just thought some of you might be interested.




Karl Cunningham
La Mesa, CA.
PSN station #40
karlc@.......

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From: Doug Crice 
Subject: Re: quake  4
Date: Thu, 16 Jul 1998 09:51:07 -0700

I rather appreciate the re-posting of the USGS reports.  It's an easy
way to get the magnitude and location, which doesn't usually come
through the usual messages.  Sure, I could look it up, but I wouldn't.
-- 
Doug Crice          web site http://www.georadar.com
GeoRadar Inc.             e-mail dcrice@............
19623 Via Escuela Drive           phone 408-867-3792
Saratoga, CA 95070 USA              fax 408-867-4900


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From: Karl Cunningham 
Subject: Re: quake  4
Date: Thu, 16 Jul 1998 13:17:30 -0700

I subscribe to the Quake-L email list from LISTSERV.NODAK.EDU.  Although it
is not limited to USGS reports, there is so little other traffic it might
as well be.

I offer this as a suggestion that might satisfy some people -- one could
get the reports automatically yet not have them come through this list.


Karl Cunningham
La Mesa, CA.
PSN station #40
karlc@.......

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From: Robert Avakian 
Subject: Re: quake  4
Date: Thu, 16 Jul 1998 15:56:53 -0700

How do we subscribe to the service?  

Bob Avakian

Karl Cunningham wrote:
> 
> I subscribe to the Quake-L email list from LISTSERV.NODAK.EDU.  Although it
> is not limited to USGS reports, there is so little other traffic it might
> as well be.
> 
> I offer this as a suggestion that might satisfy some people -- one could
> get the reports automatically yet not have them come through this list.
> 
> Karl Cunningham
> La Mesa, CA.
> PSN station #40
> karlc@.......
> 
> _____________________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email listserver@............. with the body of the
> message: leave PSN-L


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From: "Francesco" 
Subject: ADRIATIC SEA   e SANTA CRUZ
Date: Thu, 16 Jul 1998 23:55:57 +0200

h 17.29   UTC
MB 4.4
Located: Central Adriatic Sea  - Greece-Albania border region

----------------------------

All italian station had registered at 14.16 Utc  Santa Cruz Island quake =
 Ms 6.6
Good S  and large LQ -  LR


Francesco Nucera
I.E.S.N.  - PSN ITALY









h 17.29   UTC


MB 4.4


Located: Central Adriatic Sea  =
-=20
Greece-Albania border region


 


----------------------------


 


All italian station had registered =
at 14.16=20
Utc  Santa Cruz Island quake  Ms 6.6


Good S  and large LQ - =20
LR


 


 


Francesco Nucera


I.E.S.N.  - PSN=20
ITALY


From: Arie Verveer 
Subject: Re: SG Electronics
Date: Fri, 17 Jul 1998 03:15:17 +0800

Hi Meredith

> I'd be interested in seeing your low frequency event files
> for the bigger events.

What luck,  the " Ms6.6 Santa Cruz Islands " is a good exampleof the low
frequency response of the seismometer. I've
just posted the event to the PSN event list.
{High frequency "AU3" ,  Low frequency "AU4"}
I haven't post filtered the data but did cut the samples down to
10 per second to save space in posting.


> Do have a question.....is your electronics basically the same as
> per the PSN schematic, or...is it different, or is it Larry Cochranes
> commercial amplifier model?
>

Its Larry's commercial amplifier. The only thing that I havechanged is the
low frequency response for the N-S seismometer.
It was made to respond to slightly higher frequency's and thus
give a reasonable "P" and "S" wave from the events that come
from the Java trench area. I left the E-W alone.
The amplifier works very well.


All the best


Arie.



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From: meredith lamb 
Subject: SG Electronics
Date: Thu, 16 Jul 1998 22:36:19 -0600

Hi Arie,

Thanks for the fast service on the Santa Cruz quake and your
low frequency seismogram response-ha.  Luck yes!

Interesting.  I put one gram behind the other up against a lamp,
and except (generally) for the short period waves amplitude,
theres not a great deal of difference overall.

Obviously, the amplifier does indeed work well.

Two more questions.  Whats the weight of your S-G mass?
Whats your hinge material, thickness, width, and distance
between hinges?  For comparison to the original on the PSN site.

...........

>From all the PSN seismograms I've seen of the Santa Cruz
Islands quake, it appears like the travel times for deeper quakes
and phases like, Lq-Lr, is obviously shorter than standard surface
quakes, as none seem to really match up as marked for their
apparent respective phases...including mine of course-ha.

Thanks, Meredith Lamb





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Public Seismic Network Mailing List (PSN-L)


From: "David A. Nelson" 
Subject: ANOTHER large west Pacific event 
Date: Fri, 17 Jul 1998 21:42:42 +1200


  09:30 UTC  17 July     another large west pacific event in progress

 surface waves  now dying off for me and  tony in hawaii


Dave

Co-ordinator:
New Zealand
Public Seismic Network
			Dave A. Nelson   ZL4TBN
			24 Jensen St.,   
			Green Is., Dunedin,  
			South Is.. New Zealand.  

http://psn.quake.net/dave/home.htm   

IF there indeed are other parallel universes... I can now rest in the
knowledge, that in at least one of them, I am filthy rich and drive a red
Ferrari


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From: "Francesco" 
Subject: LARGE EVENT
Date: Fri, 17 Jul 1998 12:56:39 +0200

LARGE SURFACE WAVE
08.50 UTC
NEW GUINEA?

FRANCESCO NUCERA
I.E.S.N. PSN ITALY









LARGE SURFACE WAVE


08.50 UTC


NEW GUINEA?


 


FRANCESCO=20
NUCERA


I.E.S.N. PSN ITALY


From: barry lotz 
Subject: Re: ANOTHER large west Pacific event
Date: Fri, 17 Jul 1998 04:47:29 -0700

Hi
 Picked it up here in California also.
                             Barry


>David A. Nelson wrote:
> 
>   09:30 UTC  17 July     another large west pacific event in progress
> 
>  surface waves  now dying off for me and  tony in hawaii
> 
> Dave
>

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From: Karl Cunningham 
Subject: Re: quake  4
Date: Fri, 17 Jul 1998 10:50:34 -0700

Bob --

Here are the instructions for the QUAKE-L list:

The QUAKE-L list is for general discussions about earthquakes. The list
covers a wide range of topics from discussions of specific earthquakes and
the after-effects to various theories and scientific principles of
earthquakes and related phenomena. QUAKE-L is now on
listserv@.................. (host site is the North Dakota Higher Education
Computer Network).

To subscribe to the list send e-mail to listserv@.................. with
the command:

sub quake-l [your_first_name your_last_name]
For example: sub quake-l James Witt
You will be asked to confirm your subscription and will then be sent
further information about workings of the LISTSERV server. The QUAKE-L
owner/manager is Marty Hoag, hoag@................. 

Karl Cunningham
La Mesa, CA.
PSN station #40
karlc@.......


At 03:56 PM 7/16/98 -0700, you wrote:
>How do we subscribe to the service?  
>
>Bob Avakian
>


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From: barry lotz 
Subject: Santa Cruz vs Papua NG
Date: Fri, 17 Jul 1998 18:10:07 -0700

Dave 
   The pervious discussion about surface waves and event depth is
displayed in the difference between these two events. One at around 33k
with large surface wave component and the other at 110k w/o much surface
wave component. Both are in the same general area . Good call.
                                       Barry

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From: Arie Verveer 
Subject: Re: SG Electronics
Date: Sat, 18 Jul 1998 20:08:23 +0800

Hi Meredith,

> Two more questions.  Whats the weight of your S-G mass?
> Whats your hinge material, thickness, width, and distance
> between hinges?  For comparison to the original on the PSN site.
>

The Pendulum weighs around 70 grams. The hinge is made up oftwo separate brass hinges some
0.002" in thickens by 8 millimetres
wide and 5 mm between the hinges. The hinges are separated by
28 mm between centres. The pendulum has a natural frequency
around  1 Hertz.

Image at:

http://www.iinet.net.au/~ajbv/SG/Penbulum/Pendulum.htm

I should include these numbers in the web page. I'll put
it on the list of things to do.

All the best.

Arie.




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From: "Margarida Conde" 
Subject: SDR questions
Date: Sat, 18 Jul 1998 15:38:26 +0100

Two questions about SDR:
1) How to keep the SDR time accurate?
In the documentation I´ve found references to a short wave radio receiver.
Are there any alternatives? For instance, can I keep my PC clock accurate by
the network?
Which DOS software should I use? Can SDR do that alone?
2) Where to get the latest version of SDR? I believe that the one at
http://psn.quake.net is not the latest one. Am I wrong?
TIA
Margarida Conde
mconde@...............



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From: bob ogburn 
Subject: Re: SDR questions
Date: Sat, 18 Jul 1998 09:10:57 -0700

In response to Q1:
The method used here is to synchronize the local clock using the SNTP (pr=
otocol)
as described in RFC 1796.
It is important to select a time server that has the most consistent path=
 as
determined by using trace route.
This technique is not automatic, you must periodically run a time synch t=
o
correct your local clock.
In Windows, I use the time sync routine in a program called NetScanTools
(shareware from Kirk Thomas), a very useful suite.
To obtain a DOS compatible program, search for SNTP at the shareware site=
s.

An alternative, real-time method would be to recover the UTC information =
from a
GPS receiver and record it using your data collection routine.

bob ogburn PSN Daly City California E-W SG

Margarida Conde wrote:

> Two questions about SDR:
> 1) How to keep the SDR time accurate?
> In the documentation I=B4ve found references to a short wave radio rece=
iver.
> Are there any alternatives? For instance, can I keep my PC clock accura=
te by
> the network?
> Which DOS software should I use? Can SDR do that alone?
> 2) Where to get the latest version of SDR? I believe that the one at
> http://psn.quake.net is not the latest one. Am I wrong?
> TIA
> Margarida Conde
> mconde@...............
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@............. with the body of the
> message: leave PSN-L




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From: "David A. Nelson" 
Subject: 3RD BIG SW Pacific quake
Date: Sun, 19 Jul 1998 08:30:02 +1200

hi all
           the 3rd big quake in this pa4rt of the world in as many days

  Ms6.0  in the Vanuatu Islands


 BTW  the Mw7.1  from the nth coast of  PNG  caused a 7 metre   (~22ft)
tsunami  drowning at least 70 ppl  as it wiped out coastal villages in this
VERY remote part of the country.

Dave


Co-ordinator:
New Zealand
Public Seismic Network
			Dave A. Nelson   ZL4TBN
			24 Jensen St.,   
			Green Is., Dunedin,  
			South Is.. New Zealand.  

http://psn.quake.net/dave/home.htm   

IF there indeed are other parallel universes... I can now rest in the
knowledge, that in at least one of them, I am filthy rich and drive a red
Ferrari


_____________________________________________________________________

Public Seismic Network Mailing List (PSN-L)


From: Larry Cochrane 
Subject: Re: SDR questions
Date: Sun, 19 Jul 1998 15:21:30 -0700

Hi Margarida,

At 03:38 PM 7/18/98 +0100, you wrote:
>Two questions about SDR:
>1) How to keep the SDR time accurate?
>In the documentation I´ve found references to a short wave radio receiver.
>Are there any alternatives? For instance, can I keep my PC clock accurate by
>the network?
>Which DOS software should I use? Can SDR do that alone?

Here in the lower United States (from what I hear WWV does not work very
well in Alaska, and Hawaii has WWVH so it should work very well there) SDR
users can use WWV, or WWVB with the new release of SDR coming out soon. It
can also use the serial port that is connected up to another system that
can send out accurate time. The serial port can be use to daisy chain
several SDR systems together, if you need more than 6 channels, or it can
be connected up to a system that is using NTP (Network Time Protocol) or
some other means to keep its clock accurate. SDR then checks the time on
the other system every 15 minutes and uses this info for its internal time
keeping.  

NTP shou