From: Roger Baker Subject: Re: VBB Feedback Date: Wed, 31 Dec 1997 14:43:22 -0600 Friends, There has been a lot of good discussion of force balancing feedback lately, an approach which is pretty much needed for vertical instruments and likely could be used with advantage the Lehman configuration too. Let me add a few comments of my own based on practical experientation. I remain in awe of the experts on such matters. One way to use force feedback, appropriate when the feedback force must be weak, is simply to use a very low pass filter to apply a little trimming force to recenter the DC displacement sensor in its most sensitive zone. This is perhaps best described as drift compensation and sacrifices very low frequency response by constantly nudging the sensor in the direction of its slow average midpoint reading. The signal used is the relatively fast response from the sensor, which may still be noisy due to natural period oscillations. A practical example from my recent experience is a torsion magnetometer which uses a Helmholtz coil to apply a weak field to keep a light beam centered in the detector. The fast oscillations of the magnet/mirror still needed to be damped magnetically with a copper ring. This method is very easy to apply and is intuitive and straightforward and nothing much can go wrong but it doesn't achieve tight dynamic control over the feedback loop. Tight feedback loops and servosystems with response times shorter than the natural period of the system are the best way to go, but tend to require complex analysis to achieve optimum results. Horowitz and Hill deal with the elements of stability criteria in the Art of Electronics. PHDs and mathematicians are in high demand where control system design involving nested feedback loops is concerned. There are some standard tricks that can be used to partly tame control systems and allow maximum gain in the feedback loop without oscillation such as a notch filter to kill gain at the natural period of the system, linking the sensor as closely as possible to the source of force, reducing feedback gain until the system stabilizes, etc. I have found it possible to use a simple adjustable filter in the feedback loop between the voltage output from the sensor and the force coil to stabilize several different magnetic force feedback systems. Assume we have a twelve volt regulated power supply with a virtual ground, a reference point at the voltage midpoint. Our displacement sensor generates a DC voltage which fluctuates above and below this ground reference and we want to feed back magnetic force to push a suspended mass very nearly back towards the point that results in the sensor output being the same as the ground reference voltage, plus six volts in this case. We can feed back the difference betwen the sensor output and the reference voltage straight into a magnetic coil which has one lead tied to this midpoint reference so that the force will try to push the system back to the midpoint. Which is when the system will usually turn into an oscillator, and which we don't want, but it usually means we're on the right track. Instead, I tie the noninverting input of an op amp to the reference voltage. Then I use about a one meg potentiometer and about a one MFD capacitor connected together in parallel between the buffered (meaning we run it through a little op amp voltage follower to beef up its output current a little) sensor output and the inverting input of the op amp. Then I put a second identical pot/cap pair in parallel between the inverting input of the op amp and its output. This is where the feedback resistor of the op amp normally goes. Thats it. The fact is that in many cases some empirical setting of the two pots will OFTEN kill the feedback oscillations and cause the system to lock onto and control the position of the mass in the desired and stable fashion. I like to follow the sensor voltage with a DC amplification stage, where the voltage signal is increased by ten or a hundred times and the output fed into an LED so that one can see the system stabilize by the lack of flickering at the natural oscillation period of the system. This amplified DC output from the sensor is also used as the data stream. The practical effect of such a filter is consistant with all the recent discussion, but I offer it here as a practical way to tame feedback oscillations in systems with natural periods of less than a second. Since magnetic coils tend to have a low resistance, we may need to hang a booster transistor between the output of the op amp and the coil to give lots of current to handle peak demand, but normally the system will probably be nearly balanced and the power demand on the force coil will be low. --Yours, Roger Baker At 09:39 PM 12/30/97 -0600, you wrote: >Karl and co, >Karl, >Our mail passes in the dark, or wherever internet mail goes. I just sent >you: (in case you didn't get it.): > >Karl, >I think I told you already that I have have made a pass at a transfer >function for a 40 second To for your instrument with these >parameters: r = 212 800 V/M (requires 20x gain after your LVDT), Gn = >5.1N/A (for your main coil), M = 0.3kg (much reduced from your 2.27kg, or 5lb, >but needed for the flatness to 10 hz, with damping at 0.69), C= 16 uf, >Rp = 361K ohms, RI = 127K, Rf = 7 ohms, TI = 20 seconds, and To = >4 seconds. This gives a response of 3685 volts/m/sec, flat from 40 >seconds to 10 hz. >Maybe these will be helpful for your new vertical. > >I wasn't sure if I sent all the numbers before. > >Regarding your analysis of the VBB feedback, it is pretty good on most points. >I tend to rely on the mathematical model as strongly as the engineering >intuition to understand what is going on. > >As I have mentioned before, the feedback is still a summation of currents >into the force coil, NOT voltages. So inserting a voltage amplifier between >the feedback elements and the coil will not produce a VBB response. Maybe >a "Norton" current amp might work, but unless the differential and integral >currents can both be controlled by their circuit elements, their effect >will be nil. In the transfer function, the flat response occurs when the >differential feedback dominates at less than To with the same magnitude that >the integral feedback dominates below To. In fact, this creates an oscillator >right AT To, so the proportional current through Rp is needed to damp the >system, which will actually oscillate if Rp is open. > >Regarding the relative DC or static mass movement (as compared with >the dynamic movement, which is much less): it is controlled by both the >proportional and integral currents, and depends on the sensitivity >of the mechanical suspension restoring force, which ideally would be >zero and the period infinite. However, in a stable instrument it is handy >to have the mass come to an equilibrium position, which is even more useful >since the restoring force also aids in dealing with significant >temperature effects. So the mechanical restoring force is finite but small, >meaning that the feedback will allow some DC movement of the mass. > >This amount is easily determined by measuring the displacement output >with the feedback on as well as off. On the prototype here, the ratio >is about 10 to 1. This also means that if I determine the sensitivity of >my 5-turn calibration coil (using the VRDT with the feedback off) to be >25 nanometers / microamp (it is actually 26.4), the mass only moves >2.5 nm /uamp. I need a step current of 30ua to produce a voltage of about >100 mv (peak pulse voltage) at the VBB output, which is equilavent to an >actual step movement of the mass of 12 nanometers. Naturally, if the >feedback perfectly controlled the static position of the mass, a step >calibration would not work except for the transient time of Td. > >Regarding the sensitivity of the displacement transducer: with a sensitivity >of say 50mv/micron and a 10x amp, it is 0.5 Volt/micron, or 500V/mm, or >500 000 Volts/meter. Sounds like a lot, until you realize that we are >trying to measure 10**-10 meter, or 0.1 nanometer, which would have a >voltage of only 5 microvolts, which is near the low noise limit of even >high quality amplifiers. With my prototype here, the VBB output is about >3200 V/M/sec, but the 6-second microseisms come in at only 1 to 5 millivolts. >And it took the M 7.7 in Tibet to clip the 12-bit digitizer here at 200mv. >My maximum output is 7 volts, so I need the 16-bit ADC; actually, if my >noise floor IS 5 microvolts, I have a dynamic range of 122.9db, which would >take a 20-bit ADC to resolve. And conversely, a peak of 7 volts is a peak >velocity of 2.18mm/second, or a pretty good shake (you can feel 10 microns/ >second). > >In terms of earthquake magnitude, if we have a Mb3.0 at 110km (1 deg), and >Mblg = 3.75 + 0.9*log[DELTA](degrees) +log[A](microns), the amplitude is >0.178 microns (at 1 hz). A magnitude 5 at the same distance would have an >amplitude of 17.8 microns. > >And finally, regarding the size of the mass: larger is better if you have >a powerful feedback coil, like the 90N/A in the S5000 with the ll kg >mass, but the commercial VBB sensors have masses from 0.3 to 0.6 kg, with >force coils around 20N/A for more high frequency output. If I model your >sensor with the 2.7kg mass, the response is a rounded bump, much like a >narrowband LP seis; the feedback currents simply cannot control it. >The response is nicely broad and flat with the 0.3kg mass. > >I hope that I have answered your questions. > >Regards, >Sean-Thomas > >_____________________________________________________________________ > >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: Marnie Gannon Subject: Yikes..Mammoth again Date: Wed, 31 Dec 1997 13:55:09 -0700 Update time = Wed Dec 31 12:47:29 PST 1997 Here are the 30 most recent earthquakes and all big earthquakes on this map... MAG DATE LOCAL-TIME LAT LON DEPTH LOCATION y/m/d h:m:s deg deg km 1.7 97/12/31 12:44:36 37.64N 118.87W 7.2 6 mi E of MAMMOTH LAKES 1.4 97/12/31 12:43:36 37.63N 118.84W 7.5 7 mi E of MAMMOTH LAKES 1.9 97/12/31 12:43:03 37.63N 118.86W 7.7 6 mi ESE of MAMMOTH LAKES 3.2 97/12/31 12:41:47 37.63N 118.86W 7.0 6 mi E of MAMMOTH LAKES 1.4 97/12/31 12:41:28 37.63N 118.83W 8.5 8 mi ESE of MAMMOTH LAKES 3.7 97/12/31 12:39:52 37.62N 118.86W 5.2 6 mi ESE of MAMMOTH LAKES 4.7 97/12/31 12:36:47 37.63N 118.87W 6.9 6 mi ESE of MAMMOTH LAKES 1.8 97/12/31 12:36:31 37.63N 118.87W 6.3 6 mi E of MAMMOTH LAKES _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: VBB Feedback Date: Wed, 31 Dec 1997 13:29:38 -0800 Sean-Thomas: To increase the effective feedback coil sensitivity, consider a current-in/current-out amplifier. I haven't looked into the magnitude of noise and drift introduced from the op-amp, but the following circuit may work: R1 +---\/\/\/\-----+ | | | |\ | | | \ | Current from VBB Feedback Ckt ---+---|- \ | R2 | >-----+---\/\/\/\---- To Feedback coil +---|+ / | | / | |/ -+- \ / V The current gain is R1/(R2+Rf), where Rf is the feedback coil's dc resistance. R2 should be substantially larger than the inductive reactance of the feedback coil at the highest frequency of significant energy from the VBB feedback. Otherwise, the drive to the coil is not so purely a current and, as you say, the result won't be a true VBB response. For speaker coils and the like, this shouldn't present a problem. Also to be considered is the emf generated across the coil when moving in the magnetic field, which will disrupt the true current feedback. So long as this emf is low compared to the voltage across (R2+Rf) at the same point in time, this shouldn't be a problem either. Your sensitivity/dynamic range numbers sound good. I've done a spreadsheet with your equations so I can play with the numbers and look at the results. I'll see if I can come up with a solution with viable component values for my vertical. Thanks a lot for your help. Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: TESMECO Subject: great post Date: Wed, 31 Dec 1997 17:11:19 EST we should send more info like this on this list thanks greatly appreciated TIM SLU SEEYA _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Bob Fryer Subject: Re: great post Date: Wed, 31 Dec 1997 14:45:02 -0800 Uhhh, Tim, What post were you referring to? Bob F >we should send more info like this on this list > > thanks greatly appreciated TIM SLU > > >SEEYA > >_____________________________________________________________________ > ----- earthquake WARNING research ----- --- animals, people, scientific evidence --- --- http://www.teleport.com/~bfryer --- _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: TESMECO Subject: Re: great post Date: Wed, 31 Dec 1997 18:04:32 EST the mammoth info great visual aid it was all compiled so ididnt have to go get thats all tim slu seeya _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: fmurray@......... (frank murray) Subject: Re: Notice the 3 SAF M3's... Date: Wed, 31 Dec 1997 23:12:59 GMT On Wed, 31 Dec 97 19:40:20 +0000, frank condon wrote: >Bombay Beach lives for another day! After getting out the maps and = locating the >faults in relation to the most recent activity, I believe your statement= is=20 >correct. Isn't it kind of close to the cinder cones at Obsidian Butte? = Could=20 >we be looking at the start of another geothermally active spot like = Mammoth=20 >Lakes and Little Lake? coincidentally, or perhaps not, when the niland quake at 14:32:03 occurred, the sequence at mammoth slowed to a thirteen minute gap between quakes...no other gap at mammoth had exceeded about three minutes since the M4.8...nor had any other niland quakes occurred during the time since that M4.8...after that thirteen minute gap the quakes at mammoth returned to a frequency of about one per minute...speculation??... frank fmurray@......... for my electronic college proposal see: http://home.att.net/~fjtmurray/ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: Re: VBB Feedback Date: Wed, 31 Dec 1997 17:57:33 -0600 (CST) Karl, Of course the only thing to do is to try it. My feeling is that if the designers of the commercial instruments don't do it, it probably won't work. I believe that the reason is, as I have mentioned before, that the feedback currents MUST be controlled by the three feedback elements Rp, C, and RI sumultaneously controlling the current through the feedback coil. Anything between them and the coil modifies their behavior, and the transfer function, which is actually an expression of accelerations, doesn't work. I know that your present coil will work as is; if not, speakers are cheap. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: STM-8 photos Date: Wed, 31 Dec 1997 18:05:16 -0600 (CST) To those interested in the broadband leaf spring vertical seismometer: I have spent my holiday getting up to speed with a web page at //www.eas.slu.edu/People/Staff/STMorrissey. It is a bit primitive so far, and the paper on the homemade seis is in limbo until I can find a converter from RTF to .html, but I have posted a few photos of the leaf-spring prototype. Your comments and suggestions are appreciated. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen Caruso Subject: digression? Date: Wed, 31 Dec 1997 20:19:00 -0500 (EST) I was wondering if anyone has an update on the meteor impact in greenland? STEPHEN CARUSO CET KB8UGH "Coincidence is a shortsighted mental delusion" _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: frankcnd@.......... (Frank Condon) Subject: Re: Yikes..Mammoth again Date: Wed, 31 Dec 1997 17:45:42 -0800 (PST) So Mammoth Mountain takes a vacation for the holidays. But, returns to celebrate the New Year with a bang! Frank Condon mail to:frankcnd@.......... "Located in the seismic corridor somewhere between Fontana & Mammoth Lakes" >Update time = Wed Dec 31 12:47:29 PST 1997 >Here are the 30 most recent earthquakes and all big earthquakes on this >map... > >MAG DATE LOCAL-TIME LAT LON DEPTH LOCATION > y/m/d h:m:s deg deg km > >1.7 97/12/31 12:44:36 37.64N 118.87W 7.2 6 mi E of MAMMOTH LAKES >1.4 97/12/31 12:43:36 37.63N 118.84W 7.5 7 mi E of MAMMOTH LAKES >1.9 97/12/31 12:43:03 37.63N 118.86W 7.7 6 mi ESE of MAMMOTH LAKES >3.2 97/12/31 12:41:47 37.63N 118.86W 7.0 6 mi E of MAMMOTH LAKES >1.4 97/12/31 12:41:28 37.63N 118.83W 8.5 8 mi ESE of MAMMOTH LAKES >3.7 97/12/31 12:39:52 37.62N 118.86W 5.2 6 mi ESE of MAMMOTH LAKES >4.7 97/12/31 12:36:47 37.63N 118.87W 6.9 6 mi ESE of MAMMOTH LAKES >1.8 97/12/31 12:36:31 37.63N 118.87W 6.3 6 mi E of MAMMOTH LAKES > >_____________________________________________________________________ > >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: dean sevold Subject: Fwd: Re: Meteorite fall Date: Wed, 31 Dec 97 18:58:00 PST Date: Tue, 30 Dec 97 11:41:48 PST From: Klaus Georg Hansen To: dean sevold Subject: Re: Meteorite fall Dear Dean No news - Nothing will happen before January 2nd 1998. I'll keep you informed. Happy New Year. Klaus This is all the news from greenland, but am expecting more shortly Deasn _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ken Navarre Subject: Re: LEAF-SPRING Date: Wed, 31 Dec 1997 19:22:32 -0800 (PST) On Mon, 29 Dec 1997, S-T Morrissey wrote: > Ken and Jim, > The word to the wise about out-of-control leaf springs IS good advice. > One of mine got loose and flung a good collection of small stainless > hardware into the next room, causing my dogs to panic and hide in the > bedroom. Yeah, that sounds like what I observed... :( [snip] > Regarding damping with magnets, it was used on all the early seismometers > that has optical levers. It uses the principle of eddy currents, where > a thick copper vane moves in a very strong magnetic field. The movement > causes currents in the copper, whose induced field counters the motion. > I would consider using rare-earth magnets with an old real copper penny. I've installed the magnet from a large speaker in the vertical plane under the end of the boom. For damping I've hung a piece of copper salvaged from a high voltage electrical bus its 4" x 4" x 1/4" and weighs a couple pounds. A 2 mm seperation between the magnet and copper damps the swing in 2 cycles. A small ceramic magnet is attached to the top of the boom and faces the sensing coil. The sensing coil is mounted with aluminium angle and is easily adjusted to minimal spacing. This arrangement is certainly no improvement to Sean's design but it gave me a vertical to get on-line while I get up to speed with the electronics. KEn _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: New Event Date: Wed, 31 Dec 1997 12:16:39 -0800 Hi all Has anyone picked up a fairly large distant event @ about 06:10:51 UTC 01/01/98? It's possible I'm picking up wind vibrations. Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: frankcnd@.......... (Frank Condon) Subject: Re: New Event Date: Thu, 1 Jan 1998 00:57:10 -0800 (PST) I see this one is listed for the proper time. 98/01/01 06:11:16 24.00N 141.99E 33.0 6.7Mb B VOLCANO ISLANDS REGION Must not be the wind. Frank Condon >Hi all > Has anyone picked up a fairly large distant event @ about 06:10:51 >UTC 01/01/98? It's possible I'm picking up wind vibrations. > Barry > >_____________________________________________________________________ > >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: Seisguy Subject: Fwd: Earthquakes Fewer, Deadlier in '97 Date: Thu, 1 Jan 1998 07:50:58 EST 
Earthquakes Fewer, Deadlier in '97


.c The Associated
Press


 WASHINGTON (AP) - The U.S. Geological Survey reports there were fewer
earthquakes than usual in 1997, but they killed more people.

The agency said Wednesday it recorded 17 major tremors during the year,
meaning those with a magnitude of 7.0 or more and thus capable of widespread,
heavy damage.

The annual average is 20 major quakes. There were 21 in 1996.

Meanwhile, the agency said it recorded the first significant quake of 1998 at
1:11 a.m. EST today in a string of unoccupied volcanic islands off Japan.

It said the epicenter of the quake, which recorded a preliminary magnitude of
6.5, was about 65 miles southwest of Iwo Jima and was unlikely to have been
felt because of the isolated location in the Pacific Ocean. There were no
reports of damage.

Despite the decline in temblors, the 1997 death toll was at least 2,913, up
from 449 in 1996, according to figures compiled by the Survey's National
Earthquake Information Center in Golden, Colo.

The year's deadliest earthquake struck northern Iran on May 10 with a
magnitude of 7.1. It caused at least 1,567 deaths, 2,300 injuries and left
50,000 homeless.

In the United States the year's strongest quake had a magnitude of 4.9 and
struck the state of Washington in June, causing slight damage at Bremerton and
Poulsbo.

Other significant earthquakes for the year occurred near the East coast of
Kamchatka, Russia, and near the coast of central Chile.

The strongest earthquake in the world in 1997 struck Xizang Province, Tibet,
about 520 miles north-northeast of Katmandu, Nepal, on Nov. 8.

AP-NY-01-01-98 0701EST


 Copyright 1997 The Associated
Press.  The information  contained in the AP news report may not be published,
broadcast, rewritten or otherwise distributed without  prior written authority
of The Associated Press. 


 

To edit your profile, go to keyword NewsProfiles.
For all of today's news, go to keyword News.
From: Robert L Barns <75612.2635@..............> Subject: Rockland filter Date: Thu, 1 Jan 1998 09:16:44 -0500 Hi gang, Here's something you might look for at a hamfest or on used equipment lists. I find it a very useful accessory to my Lehman. I got it from Bi= ll Scolnic. He found it at a hamfest. He uses a Kron-Hite filter which I think is quite similar. I'm guessing that $100 or so might get one or th= e other at a hamfest. It is a Rockland Systems Corp. adjustable filter, Model 1022F. It is i= n a 19" rack mount case 5 1/2" high and is not very heavy. It contains 2 identical sections and the data below are for each section. I don't have the manual so the data are my measurements. A switch selects either low or high pass. There are 3 decimal dials (X.XX) and a 1X, 10X, 100X and 1000X range switch. This allows setting the knee frequency from 0.01Hz to 9,990 Hz! A switch selects either 0 or 20db gai= n. With the knee frequency set at either 0.08Hz or 200Hz, I found that the slope above the knee of the low pass filter is 24db/octave with no vis. ripple. Who could ask for anything more? The output is from DC with an offset in the output of about 5 mV and I saw no clipping with output voltages up to 9V. The input impedence is 1= megohm. There is a switch for each section labelled BW-AC. Can anyone explain this switch? I don't know the vintage but found it interesting that the active components look to be all transistors-no op-amps. When I got it, the lef= t section worked fine but the right section was a mess. Each section consists of 5 or 6 small (3X4" about) plug-in cards. I started to troubleshoot the right section by swapping these cards from section to section but I discovered that one of the cards in the right section was plugged-in BACKWARDS. Putting this in the right way fixed it. Since I have only one seismometer, I'm using it set at 0.08Hz with the= two sections in series so that the slope above the knee is 48db/octave. = With my old home-made 6-pole 0.08Hz filter, I could always see some of th= e noise peak at 0.016Hz. With 48 db/octave, this peak is not seen. A filter which is so easily adjusted opens the door to various experiments. Happy hunting & Happy New Year! Bob Barns = = _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Bob Thomasson <102073.3346@..............> Subject: Re: Notice the 3 SAF M3's... Date: Thu, 1 Jan 1998 12:58:56 -0500 <> The same day of the Sylmar, CA quake in 1970 a new fumarole opened up at Hot Creek near Mammoth. The USGS claimed it was pure coincidence, but it= does make you wonder, doesn't it? Regards, Bob _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Norman Davis WB6SHI Subject: Re: STM-8 photos Date: Thu, 01 Jan 1998 11:48:22 >I have spent my holiday getting up to speed with a web page >at //www.eas.slu.edu/People/Staff/STMorrissey. Just tried it and it says no such page Norman Davis WB6SHI Email normd@............. Shingle Springs, Ca, USA it ain't local... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: RADIOTEL Subject: SEAN-THOMAS'S WEB PAGE Date: Thu, 1 Jan 1998 14:39:57 EST TO: SEAN-THOMAS I think I may have copied your web page address incorrectly. Tried to access it but was informed repeatedly that AOL could no find URL. Can you give it again. I copied: http://www.eas.slu.edu/People/Staff/STMorrissey Jim Allen Cerritos, California _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Jim Hannon Subject: Re: STM-8 photos Date: Thu, 01 Jan 1998 13:54:19 -0600 Norman Davis WB6SHI wrote: > > >I have spent my holiday getting up to speed with a web page > >at //www.eas.slu.edu/People/Staff/STMorrissey. > > Just tried it and it says no such page > > Norman Davis WB6SHI > Email normd@............. > Shingle Springs, Ca, USA it ain't local... > I had to fiddle around a little to find it. TRY http://www.eas.slu.edu/People/STMorrissey/index.html -- Jim Hannon http://soli.inav.net/~jmhannon/ 42,11.90N 91,39.26W WB0TXL _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Charlie Rond Subject: Re: SEAN-THOMAS'S WEB PAGE Date: Thu, 01 Jan 1998 15:16:40 -0600 Jim, >TO: SEAN-THOMAS > >I think I may have copied your web page address incorrectly. Tried to access >it but was informed repeatedly that AOL could no find URL. Can you give it >again. I copied: http://www.eas.slu.edu/People/Staff/STMorrissey >Jim Allen >Cerritos, California My apologies to Sean-Thomas for speaking for him, but I've located his page. http://www.eas.slu.edu/People/STMorrissey/index.html Thought I might step in for him while he's watching the football games :-) Happy New Year! Charlie Rond -\/\--Public Seismic Network-Memphis rond@................ (901) 360-0302 [ free BBS ] http://gandlf.ceri.memphis.edu/~rond http://gandlf.ceri.memphis.edu/~rond/psn _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: frankcnd@.......... (Frank Condon) Subject: Current Status of Mammoth Date: Thu, 1 Jan 1998 13:37:29 -0800 (PST) Hi All: Finally they updated the Web page that is dedicated to telling the public about the CURRENT CONDITION at Mammoth Lakes: --------------------------------------------------------------------------- Caldera activity: An energetic swarm of earthquakes in the south moat of the caldera (centered in the vicinity of the airport, 6 to 7 miles ESE of Mammoth Lakes) began with a M=4.8 earthquake at 12:37 PM on December 31. This swarm has included nearly 1,000 events through 9:45 AM on the 1st as detected and located by the realtime computer system. Some 48 of these earthquakes have magnitudes of M=2.5 or greater and 13 have magnitudes of M=3.0 or greater. Swarm earthquakes with magnitudes of M=3.5 or greater include M=3.6 and M=3.7 events at 12:40 PM, a pair of M=3.5 events at 4:55 PM and 9:32 PM all on the 31st, and a M=3.8 event at 4:19 AM on the 1st. The latter was part of a second swarm centered 2 miles ESE of Mammoth Lakes that began at 4:15 AM on the 1st. The pattern of ground deformation has not shown any marked changes associated with this swarm activity. The resurgent dome continues to inflate at about the same rate as observed in late-October and early November. The condition remains GREEN. ----------------------------------------------------------------- A strong upsurge in activity around the full Moon... Hmm! Is there a corelation between volcanic activity and the phases of the Moon? Could it be the ocean tides have an effect, too! Frank Condon mail to:frankcnd@.......... "Located in the seismic corridor somewhere between Fontana & Mammoth Lakes" _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: RADIOTEL Subject: Re: SEAN-THOMAS'S WEB PAGE Date: Thu, 1 Jan 1998 17:58:40 EST TO: CHARLIE ROND Thanks Charlie. Sean-Thomas's web page is very nice. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: Re: Current Status of Mammoth Date: Fri, 02 Jan 1998 12:03:26 +1200 >A strong upsurge in activity around the full Moon... Hmm! Is there a >corelation between volcanic activity and the phases of the Moon? Could it be >the ocean tides have an effect, too! > the 30 dec new moon not full moon but but sun and moon wouls be pulling in same direction 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: RADIOTEL Subject: EMON CONFIGURATION Date: Thu, 1 Jan 1998 19:51:13 EST TO: BOB HAMMOND AND ALL LIST MEMBERS Thanks to the assistance of Bob Hammon I now have EMON up and running. I have several questions: 1. Is there a way to change the resolution? My screen shows a signal pattern with the dots Not Connected. I have changed the verticle compression of displayed signal to 20 and the horizonal to 15 which seemed to help somewhat. 2. Is there a way to add color to the screen, even IBM Blue? When the program saves the traces and I view it in Winquake the trace is good. I am using EMON configured for the CIO-DAS08/Jr 12-bit A/D. Any suggestions would be appreciated. Jim Allen Cerritos, California _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Jim Hannon Subject: 3d map visulation Date: Thu, 01 Jan 1998 18:59:05 -0600 A friend just sent me this link. Very interesting freeware for visulation of 3d map data and some links to online 3d map data. Haven't tried it out yet. http://www.monumental.com/rshorne/3dem.html -- Jim Hannon http://soli.inav.net/~jmhannon/ 42,11.90N 91,39.26W WB0TXL _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: web page Date: Thu, 1 Jan 1998 19:06:46 -0600 (CST) Hi Meredith, Norman,Jim, Larry, Charlie. Mike, et al. I appreciate your comments on my effort at a web page. Sorry about making it hard to find; when I start netscape on our server, it defaults to the department page, and I just click on the People, Staff. etc to get around. I guess other access needs the final path links. I appreciate Charlie's effort at solving the problem. I wonder what an aol access would find at just //www.eas.slu.edu ??. So I spent the day replacing the protorype leaf spring broadband with the "new, improved" BETA instrument on my pier in the basement. Of course its' too soon to evaluate it, but it seems to be continuing the 6-second microseism noise (from the storm off the east coast) and the local windy-day noise that the prototype was producing, and the calibration pulse still looks like that of a 90 second instrument. I will try to get sharper, clearer photos of it onto the web page. I've also been advised that html doesn't DO equations, so I'll scan the figures, graphics, and schematics for the paper and post them. Maybe tomorrow. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Marnie Gannon Subject: NPR- Volcano Date: Fri, 02 Jan 1998 11:02:47 -0700 Hey Guys.. taking a look around NPR archives..last weeks' Science Friday has an hour long report on volcanoes in realaudio..If you don't listen today then you will need to go to the archives..Go Here: http://www.npr.org/programs/totn/archives/scifricurrent.html Discussion with David Hill at Long Valley, Steve Malone of UW re Rainier and other Cascadia Volcanoes, and Jill Norton, chief scientist at Montserrat..also a call in section which touches on other US volcanoes.. Marnie _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Seisguy Subject: Fwd: Mexico Volcano Spews Ash, Lava Date: Fri, 2 Jan 1998 13:20:57 EST Happy New Year Popo! Now take some Tylenol and sleep it off.....;-) Mike 
Mexico Volcano Spews Ash, Lava


.c The Associated
Press


 MEXICO CITY (AP) - Hot ash rained on the outskirts of Mexico City when snow-
capped Popocatepetl volcano erupted for the second time in two weeks, spewing
glowing rock and smoke into the air.

The 18,000-foot volcano settled down 90 seconds after erupting Thursday
evening, and there were no reports of injuries or damage, officials told the
government news service Notimex.

Ash fell on nearby communities, and Notimex said the roar of the eruption
shook windows and doors of houses. Authorities said the eruption was
accompanied by a magnitude-3.5 earthquake.

The volcano 45 miles southeast of Mexico City last erupted on Dec. 24.

Government Ministry official Ricardo Garcia Villalobos was quoted by Notimex
as saying the smoke from the most recent blast rose two miles into the sky.

He said the blast was smaller than the June 30 eruption that shot a
40,000-foot plume of ash into the air, the biggest exhalation since 1925. It
coated Mexico City in ash, causing massive traffic jams.

Popocatepetl - which means ``smoking mountain'' in the language of the ancient
Aztecs - had been quiet for 70 years until periodic eruptions began in 1994.

AP-NY-01-02-98 0435EST


 Copyright 1997 The Associated
Press.  The information  contained in the AP news report may not be published,
broadcast, rewritten or otherwise distributed without  prior written authority
of The Associated Press. 


 

To edit your profile, go to keyword NewsProfiles.
For all of today's news, go to keyword News.
From: "David A. Nelson" Subject: Mt Ruapehu active Date: Sat, 03 Jan 1998 10:03:57 +1200 hi all, trust everyone has recovered from the festivities and there are not tooo many sore heads. :) just to let u know yesterday 02 Jan 98 New Zealand Mt ruapehu did 2 significant ash eruptions covering the mountain slopes with the fallout. These are the first for the last ~3 months cheers all 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: Re: SFBA PSN records for Mike Antolik Date: Fri, 02 Jan 1998 14:53:01 -0700 PSN members in the San Francisco Bay Area- 3-dimensional, finite-difference models of seismic wave propagation and site response in the San Francisco Bay Area created by members of the Seismic Station at UCB can be seen: http://www.seismo.berkeley.edu/seismo/events_of_interest/3dmod/3dmod.html -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: shammon1@............. Subject: Re: SFBA PSN records for Mike Antolik Date: Fri, 02 Jan 1998 18:45:07 -0800 Hi Ed, (and group) Great meeting-- I've been kind of slow in getting my act together because of the holidays... I have the film from the meeting at the local photo drop and as sonn I get it back and the scanner running again I'll post them to the San Jose PSN web site. I'll make an announcement on the PSN-List as soon as it done. QUESTION-- help me out here. When was the Alum Rock Quake? I lost my notes and I'm looking for the data you asked about. Regards, Steve Hammond PSN San Jose Edward Cranswick wrote: > > PSN members in the San Francisco Bay Area- > 3-dimensional, finite-difference models of seismic wave propagation and > site response in the San Francisco Bay Area created by members of the > Seismic Station at UCB can be seen: > > http://www.seismo.berkeley.edu/seismo/events_of_interest/3dmod/3dmod.html> > -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) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Seisguy Subject: Re: SFBA PSN records for Mike Antolik Date: Fri, 2 Jan 1998 21:26:39 EST In a message dated 98-01-02 20:52:26 EST, you write: > QUESTION-- help me out here. When was the Alum Rock Quake? I lost my > notes and I'm looking for the data you asked about. > Steve, that M4.7 quake was May 21, 1996 @ 1:50pm. Regards, Mike O'Bleness Northridge, Ca _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: EMON CONFIGURATION Date: Fri, 02 Jan 1998 06:23:54 -0800 Hi Jim I asked Ted the same question several years ago. Plotting is done with points rather than lines to speed up the program sample rate. PSET is quicker than LINE. I don't know about the color. I have been viewing green on black for a while. I guess I got use to it. Barry RADIOTEL wrote: > > TO: BOB HAMMOND AND ALL LIST MEMBERS > > Thanks to the assistance of Bob Hammon I now have EMON up and running. I have > several questions: > 1. Is there a way to change the resolution? My screen shows a signal pattern > with > the dots Not Connected. I have changed the verticle compression of > displayed > signal to 20 and the horizonal to 15 which seemed to help somewhat. > 2. Is there a way to add color to the screen, even IBM Blue? > When the program saves the traces and I view it in Winquake the trace is good. > I am using EMON configured for the CIO-DAS08/Jr 12-bit A/D. > > Any suggestions would be appreciated. > Jim Allen > Cerritos, California _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: STM-8 documents Date: Fri, 2 Jan 1998 21:32:03 -0600 (CST) To those interested in the broadband leaf-spring vertical seis: I managed to get some of the drawings and schematics onto my web page at //www.eas.slu.edu/People/STMorrissey/index.html. It is still a bit disorganized, and it took me a while to figure out how to get readable documents without having giant files, but it is a start. ........ And Saturday is a good day to start gathering parts ...... Your comments and suggestions are, of course, welcome. The drawings are in .gif format. Someone advised me that I could put them out in .RTF format if someone's browser had the "plug in" too read it. Any comments? Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: RADIOTEL Subject: Re: EMON CONFIGURATION Date: Fri, 2 Jan 1998 22:48:21 EST TO: BARRY LOTZ Thanks for your assistance re. EMON. Jim Allen Cerritos, California _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: peaches@............ (Donna Whitaker) Subject: Kilauea Volcano Date: Fri, 2 Jan 1998 22:30:16 -1000 (HST) Hi all. Today, Jan 3 marks the 15th year of the Pu'u O'o eruption at Kilauea volcano on the Big Island of Hawaii. Here is the Hawaii Volcano Observatory (HVO) update URL which has their latest info and some nice picts. Enjoy and Aloha. http://hvo.wr.usgs.gov/geology/update2.html Tony Potenzo PSN Kona Station _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Doug Crice Subject: Pictures and drawings on the web Date: Sat, 03 Jan 1998 10:21:20 -0800 As a general rule, I think illustrations should be in either .GIF or ..JPG format, since virtually all browsers support these two standards for viewing. ..GIF is preferred for drawings, and will generally be most efficient for them. .GIF has only 256 colors, which keeps the size down. ..JPG (or jpeg) is preferred for photographs. It's a standard file compressing method which produces small files with lots of colors. If you want to get elegant, use progressive JIF and JPG, the kind of figures that appear full size then gradually get better as more of the file downloads. That way, the reader can either be entertained while he's waiting or go on if he's not interested. There is a pretty good graphics/photo editing program Lviewpro which can create these formats from others, available for download from http://lview.com/ Doug Crice _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: Pictures and drawings on the web Date: Sat, 03 Jan 1998 11:57:23 -0700 (MST) On Sat, 3 Jan 1998, Doug Crice wrote: > As a general rule, I think illustrations should be in either .GIF or > .JPG format, since virtually all browsers support these two standards > for viewing. I think .tiff files are supported for Netscape on all platforms now as well, though I don't use them very often. > .JPG (or jpeg) is preferred for photographs. It's a standard file > compressing method which produces small files with lots of colors. > There is a pretty good graphics/photo editing program Lviewpro which can > create these formats from others, available for download from > http://lview.com/ This is true indeed. But I haven't yet found a program better than Adobe Photoshop for every graphics task. JPEGs have an option which you can control which is the compression of the graphic, which is something you can play with when saving a JPEG in Photoshop. But the accuracy of the image decreases with the amount of compression so that what you are seeing as you compress it more and more is only an approximation of the original. However, for most people browsing in 256 colors or even thousands of colors this difference is almost entirely undetectable. But then again, nothing beats the crispness of a less compressed, well-scanned photo while viewing in 32-bit true RGB. My best result of this can be seen in a photo of Superstition Mountain near Mesa I have posted to my web site. The URL is http:/www.public.asu.edu/~hernlund/ Sure, Photoshop can be expensive if you buy it yourself, but it is worth every penny. This software has also been invaluable to scientific research based on digital images (Hubble, etc.) due to all the manipulation tools and macros/filters it supports. ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: coil winding,etc Date: Sat, 3 Jan 1998 13:02:07 -0600 (CST) Jim, Before you wind your coil with 1/2 pound of # 34 wire, here are some considerations. That amount of #34 has a resistance of 1084 ohms at room temperature, which is way too much if you intend to use it for a feedback coil. I would suggest using much larger wire, not only to reduce the resistance, but to create a stronger electromagnet for use as a feedback or force coil. (This should not be confused with the voltage produced by moving a coil in a magnetic field, in which the more the turns, the greater the voltage.) For example, if you use #30, it has 170 ohms / 1/2 lb; however, it has a cross section of 0.000079 sq.", whereas the #34 is 0.000031. So the #30 has about 2.5 times the area, meaning that in the same coil form it will give 1/2.5 (0.4) times the number of turns. But the resistance of #30 is 1/6.4 (0.16) x that of #34. The strength of an electromagnet is determined by the Ampere-turns (# turns x current); so even if you get only 0.4 of the turns, with 0.16 of the resistance, you have 6.4 times the current for the same voltage, or 0.4/0.16 = 2.5 times the Ampere-turns or field strength. Going even further, #24 wire has 1/10 the cross section of #34, but only 10.5 ohm/0.5 lb, or 1/100th that of #34. so the induced field will be 10x stronger. This is why stereo speakers have such low resistances. Regarding the natural period of your seismometer; I am confused by your mention of 100 and 600 seconds; I guess that these are the length of the decay time of the free oscillations, and not the natural period. The natural period will range from less than 1 to more than 20 seconds for most mechanical systems. It is determined by measuring the time of, say, 10 oscilations, with a stopwatch and dividing. If the system has minimal frictional or air damping, it should oscillate a few mm for at least a minute or two. If you have the lower end of the leaf spring clamped to the base, it will force the natural period to be very short. Both ends of the spring must be able to flex, ie. follow the curvature of the whole spring. When the ends are about 5.5 to 6" apart, it starts to exhibit "zero length" behavior, where the restoring force is constant for small changes in length. At this point very long periods, even instability, are realized. This is achieved with coil springs by twisting the wire as it is coiled, so the spring requires a large initial force just to open it, which is why this type of spring is used for vertical seismometers. I am working on a writeup of the details of the leaf-spring installation; I will send you a draft later today. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: frankcnd@.......... (Frank Condon) Subject: The Latest Swarm in Mammoth Date: Sat, 3 Jan 1998 11:23:56 -0800 (PST) Hello All: Here is an updated CURRENT CONDITION report on Mammoth Lakes from the official USGS Long Valley Caldera Web Site: -------------------------------------------------------------------- Caldera activity: The gradual decay in the level of earthquake swarm associated with the M=4.8 earthquake of December 31 was interrupted with a slight increase in activity in the early hours of Jan. 3. This activity, which continues to be concentrated in the area between the airport and fish hatchery (5 to 7 miles E of Mammoth Lakes), included three earthquakes of magnitude M=3.0 or greater: a pair of M=3.0 events at 2:19 AM and 2:57 AM respectvely, and a M=3.2 event at 3:38 AM. The realtime computer system detected and located some 250 events over the past 24 hours, nine of which had magnitudes of M=2.5 or greater (including the three M>3 events mentioned above). The resurgent dome continues to inflate at about the same rate as observed in late-October and early November. -------------------------------------------------------------- Frank Condon mail to:frankcnd@.......... "Located in the seismic corridor somewhere between Fontana & Mammoth Lakes" _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: STM-8 documents Date: Sat, 03 Jan 1998 00:36:26 -0800 Sean Thomas I appreciate your effort. GIF is was ok for me. I used paintshop pro and had good resolution. I only had problems with the horizontal scale on the graphs (clipped) but I was more interested in the schematics. I have been looking for awhile for documentation that would increase the effective period of a sensor electronically. I am in the process of trying to take your feedback ideas and incorporating it with the vertically hung horizontal sensor (Like the SG suspension- less problem with drift than my long period garden gate Lehman). I'll let you know how it goes. I am currently trying to center the Radio Shack coil in the magnet with only a 8" sensor arm. Thanks again for your efforts. Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Tobin Fricke" Subject: Re: Pictures and drawings on the web Date: Sat, 3 Jan 1998 11:35:12 -0800 > I think .tiff files are supported for Netscape on all platforms now as >well, though I don't use them very often. I'd stay away from TIFF files on the web. If a web browser supports images at all, it will support GIF, and most likely JPG. Version 4 browsers have some support for PNG, an excellent format. Photographs should use JPG Drawings and diagrams should use GIF Tobin _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Your Name Subject: Solder Geophone Terminals??? Date: Sat, 03 Jan 1998 12:11:11 -0800 Can you solder directly to the two little terminals on top of a GS-11D geophone without messing up the sensor??? Thanks! Roger - KD6LQE _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: Re: Solder Geophone Terminals??? Date: Sat, 3 Jan 1998 14:53:22 -0600 (CST) Roger, Yes you can solder to the terminals, but with a relatively small solder pencil. The current in the tip of a solder gun may demagnetize the magnet of the little geophone. The damping resistor is usually soldered across the terminals. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: Re: Solder Geophone Terminals??? Date: Sun, 04 Jan 1998 10:02:38 +1200 At 12:11 PM 1/3/98 -0800, you wrote: >Can you solder directly to the two little terminals on top >of a GS-11D geophone without messing up the sensor??? >Thanks! Roger - KD6LQE Yes no trouble at all, al of the ones I have inastalled aroind the place i have soldered to without any problem. The sensor is very robust. like any thing electronic that u solder DONT linger there with the soldering bolt get the joint done and let it cool cheers 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: Norman Davis WB6SHI Subject: Geophone Date: Sat, 03 Jan 1998 15:45:02 I just got a copy of rtclark cataloge. There are two types of geophones. One is called shearwave and the other nothing. I asume the lower freq the better. What kind do I want? Norman Davis WB6SHI Email normd@............. Shingle Springs, Ca, USA it ain't local... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Roger Sorensen Subject: Re: Geophone Date: Sat, 03 Jan 1998 16:40:13 -0800 Norman Davis WB6SHI wrote: > > I just got a copy of rtclark cataloge. There are two types of geophones. > One is called shearwave and the other nothing. I asume the lower freq the > better. > What kind do I want? > > Norman Davis WB6SHI > Email normd@............. > Shingle Springs, Ca, USA it ain't local... Well I'm no expert, but from what I understand "shearwave" is a horizontal sensor while the other "no name" is a vertical sensor. I think in our application, the lower the freq. is the better. I just got my GS-11D geophone in the ground and it seems to work pretty well. Best of luck with yours. Roger - KD6LQE Chatsworth, CA, USA (34.16.23 118.35.62) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Charlie Rond Subject: Re: EMON CONFIGURATION Date: Sat, 03 Jan 1998 19:48:03 -0600 Jim, From my perspective, the Ted Blank software is really a package of components. EMON, of course, is the data monitoring module, QUAKEVIEW (or QUAKEVU) is the display module for a single seismogram, EL lists a group of seismograms for QUAKEVIEW to display, MSPLICE is a utility to "glue" together several files representing a single quake, HOWFAR calculates great circle distance to an epicenter from latitude and longitude, and there are other utilities. If QUAKEVIEW is present, one can display a recorded seismogram from within EMON merely by pressing F8 (and delete, annotate, etc.). The recording can be displayed as a series of data points - as you see on the screen in EMON - or with dots connected by lines (as in WINQUAKE) to any degree of horizontal or vertical compression, etc. P and S points can be picked, comments added, the recording modified and so on. If you have a lot of data files accumulated, EL (QUAKEVIEW) is the fastest way to quickly scan them. My point is that you are not fully utilizing EMON unless you also are using QUAKEVIEW (and EL). As to color: I think the answer is no. By the way, I'm not an "agent" for Ted Blank. I just think he and Larry Cochrane have provided us with some superb software we rarely exploit to full capacity. I'm running both EMON and SDR on different setups and couldn't do without either. --Charlie Rond >> TO: BOB HAMMOND AND ALL LIST MEMBERS >> >> Thanks to the assistance of Bob Hammon I now have EMON up and running. I have >> several questions: >> 1. Is there a way to change the resolution? My screen shows a signal pattern >> with >> the dots Not Connected. I have changed the verticle compression of >> displayed >> signal to 20 and the horizonal to 15 which seemed to help somewhat. >> 2. Is there a way to add color to the screen, even IBM Blue? >> When the program saves the traces and I view it in Winquake the trace is good. >> I am using EMON configured for the CIO-DAS08/Jr 12-bit A/D. >> >> Any suggestions would be appreciated. >> Jim Allen >> Cerritos, California > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) ---------------------------------------------------------------------- Charlie Rond -\/\--Public Seismic Network-Memphis rond@................ (901) 360-0302 [ free BBS ] http://gandlf.ceri.memphis.edu/~rond http://gandlf.ceri.memphis.edu/~rond/psn _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: James Subject: Mammoth Lakes question Date: Sat, 3 Jan 1998 20:36:32 -0600 (CST) Some people explain some "ufo" sightings as ball lightning caused by earthquakes. Are any reports of "lights" coming from Mammoth Lakes? _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: RADIOTEL Subject: Re: EMON CONFIGURATION Date: Sat, 3 Jan 1998 21:44:49 EST TO: CHARLIE ROND Thanks for your advice. I will certainly followup on those suggestions. Jim Allen Cerritos, California _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Bill Scolnik Subject: Re: Rockland filter Date: Sat, 3 Jan 1998 22:34:15 -0500 (EST) At 09:16 AM 1/1/98 -0500, Robert L Barns wrote: > Hi gang, > Here's something you might look for at a hamfest or on used equipment >lists. I find it a very useful accessory to my Lehman. I got it from Bill >Scolnic. He found it at a hamfest. He uses a Kron-Hite filter which I >think is quite similar. I'm guessing that $100 or so might get one or the >other at a hamfest. > It is a Rockland Systems Corp. adjustable filter, Model 1022F. It is in >a 19" rack mount case 5 1/2" high and is not very heavy. It contains 2 >identical sections and the data below are for each section. > I don't have the manual so the data are my measurements. A switch >selects either low or high pass. There are 3 decimal dials (X.XX) and a >1X, 10X, 100X and 1000X range switch. This allows setting the knee >frequency from 0.01Hz to 9,990 Hz! A switch selects either 0 or 20db gain. > With the knee frequency set at either 0.08Hz or 200Hz, I found that the >slope above the knee of the low pass filter is 24db/octave with no vis. >ripple. Who could ask for anything more? > The output is from DC with an offset in the output of about 5 mV and I >saw no clipping with output voltages up to 9V. The input impedence is 1 >megohm. There is a switch for each section labelled BW-AC. Can anyone >explain this switch? > I don't know the vintage but found it interesting that the active >components look to be all transistors-no op-amps. When I got it, the left >section worked fine but the right section was a mess. Each section >consists of 5 or 6 small (3X4" about) plug-in cards. I started to >troubleshoot the right section by swapping these cards from section to >section but I discovered that one of the cards in the right section was >plugged-in BACKWARDS. Putting this in the right way fixed it. > Since I have only one seismometer, I'm using it set at 0.08Hz with the >two sections in series so that the slope above the knee is 48db/octave. >With my old home-made 6-pole 0.08Hz filter, I could always see some of the >noise peak at 0.016Hz. With 48 db/octave, this peak is not seen. > A filter which is so easily adjusted opens the door to various >experiments. >Happy hunting & Happy New Year! >Bob Barns > > Bob, The BW/AC switch most likely changes the filter configuration from Butterworth to RC. Bill Scolnik > > >_____________________________________________________________________ > >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: Re: VBB Integrator Date: Sat, 3 Jan 1998 23:26:44 -0600 (CST) Barry et al, Your observation of the non-inverting integrator configuration is correct. It is true that most integrators are inverting, but this is just a hangover from early op-amp circuits where everything was using the inverting input. Of course, it is also a low-pass filter of one pole, and is even described in the literature as a "unit-lag" or "running-mean" amplifier. The response of an inverting integrator is: Eout = - 1/(RC)*integral [( Ein - Eout )dt]. It is the same for the non-inverting config, except without the "-" The time constant is R(ohms) x C (farads) in seconds. IF it WERE considered a filter, then the Fc would be 2*pi*R*C, as you observed. But our transfer function needs the time constant, which is actually in radians/second. As for using a single amplifier, a very low input offset and leakage current unit will work, something like the OPA111. I use the instrumentation configuration because with affordable large capacitors (ie electrolytics), leakage currents vary with temperature, etc, and I am trying to minimize all known noise sources. (I also have a box of them left over from monitoring earth currents in the Aleutians, which the Greeks claimed could predict quakes; just a bunch of noise, though). Also the two 2meg resitors should have a low a temp coefficient and be carefully matched so the amp input currents don't vary with temperature. And, of course, it does work as advertised in the 6 VBB circuits I am running with it. I do appreciate the feedback needs for clarifications. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: MAJ EVENT Date: Sun, 04 Jan 1998 19:22:58 +1200 time 06 22 utc 04 jan 98 maje event coming in 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: MA EVENT Date: Sat, 03 Jan 1998 22:34:33 -0800 Amazing, your message arrived about 30 seconds before the P wave arrived here... I was setting at my computer and your message arrived. After reading it, I looked over at my SDR systems and saw nothing. Then all of a sudden the alarm went off.... No S wave yet. -Larry At 07:22 PM 1/4/98 +1200, Dave Nelson wrote: > >time 06 22 utc 04 jan 98 maje event coming in > > >Dave _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Tom Frey" Subject: Re: MA EVENT Date: Sat, 3 Jan 1998 22:45:23 -0800 Same Here!!!! _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ron Westfall Subject: Re: MA EVENT Date: Sat, 03 Jan 1998 22:42:28 -0800 Hi The S waves reached Vancouver, BC about 3 - 4 minutes ago. They are still coming in. Ron Westfall Larry Cochrane wrote: > Amazing, your message arrived about 30 seconds before the P wave arrived > here... I was setting at my computer and your message arrived. After > reading it, I looked over at my SDR systems and saw nothing. Then all of a > sudden the alarm went off.... No S wave yet. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: watson@................ (Charles Watson) Subject: Re: Monster Quake? Date: Sat, 03 Jan 1998 22:49:24 -0700 Any word on where it was yet? -- ---/---- Charles P. Watson, Consulting Geologist Advanced Geologic Exploration Seismo-Watch / Earthquake Information Services Voice: 702-852-0992 / Fax: 702-852-3226 Office Location: 39.43N 119.71W mailto:watson@................ http://www.seismo-watch.com _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "frank murray" Subject: RE: MA EVENT Date: Sat, 3 Jan 1998 22:49:14 -0800 if everybody could pop their times and locations into their posts, we could all see the pattern of the waves... > -----Original Message----- > From: Tom Frey [mailto:tfrey@............ > Sent: Saturday, January 03, 1998 10:45 PM > To: PSN-L Mailing List > Subject: Re: MA EVENT > > > Same Here!!!! > > > _____________________________________________________________________ > > 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: Ron Westfall Subject: Re: MA EVENT Date: Sat, 03 Jan 1998 22:59:41 -0800 Hi Vancouver, BC, Canada P: approx. 6:25:00 S: approx. 6:35:45 Ron Westfall frank murray wrote: > if everybody could pop their times and locations into their posts, we could > all see the pattern of the waves... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: Re: MA EVENT Date: Sun, 04 Jan 1998 20:03:29 +1200 ok larry and i actually was ~4 minutes into the event when i mailed u guys tooo bust watching the event come in to mail sooner Dave At 10:34 PM 1/3/98 -0800, you wrote: >Amazing, your message arrived about 30 seconds before the P wave arrived >here... I was setting at my computer and your message arrived. After >reading it, I looked over at my SDR systems and saw nothing. Then all of a >sudden the alarm went off.... No S wave yet. > >-Larry > >At 07:22 PM 1/4/98 +1200, Dave Nelson wrote: >> >>time 06 22 utc 04 jan 98 maje event coming in >> >> >>Dave > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > > 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: "John Krempasky" Subject: Re: MA EVENT Date: Sun, 4 Jan 1998 02:07:13 -0500 Hmm, interesting, I've been surfing around, nothing on NEIC, this is what I've found so far (I presume this is the seismo) from the Swiss network; they don't have a loc yet. Off the scale, I guess, yes? http://seismo.ethz.ch/networks/telemetry_net/signals/KP199801040631.gif _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Tom Frey" Subject: Re: MA EVENT Date: Sat, 3 Jan 1998 23:12:00 -0800 P approx 06:25:07 @ RM1 (47.456N, 121.803W) 06:25:06 @ GM1 (47.202N, 121.790W) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: MAJ EVENT Date: Sat, 03 Jan 1998 23:11:58 -0800 At 10:59 PM 1/3/98 -0800, you wrote: >Hi > > Vancouver, BC, Canada > P: approx. 6:25:00 S: approx. 6:35:45 Redwood City, Ca USA P: 6:24:50 S: 6:35:20 Based on a depth of 33km distance = 9559km from station and a time of origin of 6:12:12UTC. Magnitude over 7 -Larry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: Re: MA EVENT Date: Sun, 04 Jan 1998 20:11:34 +1200 im posting my event file in a couple of minutes get my p arrival off there Dave At 10:59 PM 1/3/98 -0800, you wrote: >Hi > > Vancouver, BC, Canada > P: approx. 6:25:00 S: approx. 6:35:45 > >Ron Westfall > >frank murray wrote: >> if everybody could pop their times and locations into their posts, we could >> all see the pattern of the waves... > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > > 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: watson@................ (Charles Watson) Subject: Once again, it's Vanuatu Islands! Date: Sat, 03 Jan 1998 23:15:11 -0700 Once again, it's Vanuatu Islands! -- ---/---- Charles P. Watson, Consulting Geologist Advanced Geologic Exploration Seismo-Watch / Earthquake Information Services Voice: 702-852-0992 / Fax: 702-852-3226 Office Location: 39.43N 119.71W mailto:watson@................ http://www.seismo-watch.com From: Ray Gallagher Subject: Re: MA EVENT Date: Sat, 03 Jan 1998 23:17:07 -0800 e0208c0-w- d o NWS-TSUNAMI-BULLETIN-NUM 01-03 0167 TSUNAMI BULLETIN NUMBER 1 WEST COAST AND ALASKA TSUNAMI WARNING CENTER/NOAA/NWS ISSUED JAN 4 AT 0655 UTC ..THIS IS A TSUNAMI INFORMATION BULLETIN FOR ALASKA, BRITISH COLUMBIA, WASHINGTON, OREGON, AND CALIFORNIA ONLY... NO, REPEAT NO, WATCH OR WARNING IS IN EFFECT. AN EARTHQUAKE, PRELIMINARY MAGNITUDE 7.0, OCCURRED AT 2112 AST ON JAN 3, OR 2212 PST ON JAN 3, OR 0612 UTC ON JAN 4. THE EARTHQUAKE WAS LOCATED IN THE GENERAL AREA OF: SOUTH OF VANUATU NEAR 22.1S, 170.7E. THE PACIFIC TSUNAMI WARNING CENTER WILL ISSUE A TSUNAMI INFORMATION BULLETIN FOR HAWAII AND OTHER AREAS OF THE PACIFIC. EVALUATION: BASED ON LOCATION AND MAGNITUDE THE EARTHQUAKE WAS NOT SUFFICIENT TO GENERATE A TSUNAMI DAMAGING TO CALIFORNIA, OREGON, WASHINGTON, BRITISH COLUMBIA OR ALASKA. SOME AREAS MAY EXPERIENCE SMALL SEA LEVEL FLUCTUATIONS. THIS WILL BE THE ONLY BULLETIN ISSUED FOR THIS EVENT BY THE WEST COAST AND ALASKA TSUNAMI WARNING CENTER UNLESS CONDITIONS WARRANT.IF AVAILABLE, REFER TO THE INTERNET SITE (USE LOWER CASE) HTTP://WWW.ALASKA.NET/(TILDA)ATWC FOR MORE INFORMATION. EDIS-01-03-98 2257 PST _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ray Gallagher Subject: Re: MA EVENT Date: Sat, 03 Jan 1998 23:17:43 -0800 e0209c0-w- d o NWS-TSUNAMI-BULLETIN-NO. 01-03 0141 TSUNAMI BULLETIN NO. 001 PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS ISSUED AT 0701Z 04 JAN 1998 THIS BULLETIN IS FOR ALL AREAS OF THE PACIFIC BASIN EXCEPT CALIFORNIA, OREGON, WASHINGTON, BRITISH COLUMBIA, AND ALASKA. . THIS IS A TSUNAMI INFORMATION MESSAGE, NO ACTION REQUIRED . . AN EARTHQUAKE, PRELIMINARY MAGNITUDE 7.0 OCCURRED AT 0612 UTC 4 JAN 1998, LOCATED NEAR LATITUDE 22S LONGITUDE 171E IN THE VICINITY OF LOYALTY ISLANDS REGION EVALUATION: A PACIFIC-WIDE TSUNAMI WAS NOT GENERATED BASED ON EARTHQUAKE AND HISTORICAL TSUNAMI DATA. THIS WILL BE THE ONLY BULLETIN ISSUED UNLESS ADDITIONAL INFORMATION BECOMES AVAILABLE. . . NO PACIFIC-WIDE TSUNAMI WARNING IS IN EFFECT . . . RECIPIENTS OF THIS MESSAGE LOCATED IN CALIFORNIA, OREGON, WASHINGTON, BRITISH COLUMBIA, AND ALASKA SHOULD REFER ONLY TO ALASKA TSUNAMI WARNING CENTER MESSAGES FOR INFORMATION ABOUT ANY TSUNAMI THREAT IN THOSE AREAS. EDIS-01-03-98 2302 PST _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: vanuatu .... Date: Sun, 04 Jan 1998 20:47:43 +1200 i have a ham radio friend in vanuatu have jst emailed him to see if he felt it will let u know what he says cheers Dave BTW these are the largest P waves i have EVER recorded from this area will be interesting to see the final USGS report have a feeling the Mw will tell the real truth 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: Canie Brooks Subject: Loyalty Islands Date: Sun, 04 Jan 1998 00:03:40 -0800 This is the URL for the event on IDC List: http://www.cdidc.org:65120/web-bin/event/bulletin=AELs/evids=1248641/map_sca le=2 (BTW: Can anyone explain why they are always lower in magnitude than USGS?) Canie _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: Re: Loyalty Islands Date: Sun, 04 Jan 1998 21:15:12 +1200 At 12:03 AM 1/4/98 -0800, you wrote: >This is the URL for the event on IDC List: >http://www.cdidc.org:65120/web-bin/event/bulletin=AELs/evids=1248641/map_sca >le=2 > >(BTW: Can anyone explain why they are always lower in magnitude than USGS?) > >Canie it is a computer generated report mate they are ALLWAYS extremely low cheers 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: Francesco Subject: BIG QUAKE Date: Sun, 04 Jan 1998 10:15:18 +0100 Hi to all, the italian station have registered at 6.33 Utc a big quake. Large P non S and Surface wave. Preliminary location Sud Est Pacific (LOyalty Islands???) Ms =>6.9 Good Day Francesco FRANCESCO NUCERA OSIMO - Ancona - ITALY Lat. 43 29" E - Long. 13 29" E _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen Paul Subject: Re: MA EVENT Date: Sun, 04 Jan 1998 02:13:31 -0800 Larry Cochrane wrote: > Amazing, your message arrived about 30 seconds before the P wave arrived > here... I was setting at my computer and your message arrived. After > reading it, I looked over at my SDR systems and saw nothing. Then all of a > sudden the alarm went off.... No S wave yet. > > -Larry > > At 07:22 PM 1/4/98 +1200, Dave Nelson wrote: > > > >time 06 22 utc 04 jan 98 maje event coming in > > > > > >Dave > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L Larry, did you or nyone else pick up something around 1-1:30 PST? I felt a fairly muted but strong tremor in the Sherman Oaks area of So. CA this morning, and went online a bit later to see if there was any news, and lo and behold, you magic Indians had your ears to the ground! Not surprising, I was just wondering if this might be related... We get a lot of these up in the hills, very close along the line of the Northridge fault that took part of this area down in '94... Thanks, (I did get an S wave in my seat at the time...). -- Stephen Paul :^) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen Paul Subject: Re: MA EVENT Date: Sun, 04 Jan 1998 02:16:52 -0800 Larry, Actually I see by the time that these messages started appearing, it could have been earlier. I was immersed in a film and stupidly neglected to note the time... I'm sure it must be related. Any news yet? - Stephen :^) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen Paul Subject: Re: MA EVENT Date: Sun, 04 Jan 1998 02:19:39 -0800 frank murray wrote: > if everybody could pop their times and locations into their posts, we could > all see the pattern of the waves... > > > -----Original Message----- > > From: Tom Frey [mailto:tfrey@............ > > Sent: Saturday, January 03, 1998 10:45 PM > > To: PSN-L Mailing List > > Subject: Re: MA EVENT > > > > > > Same Here!!!! > > > > > > Tom, As I mentioned to Larry, I didn't get the time, but my house really swayed down here in Sherman Oaks, San Fernando Valley area of So. CA -- Stephen Paul :^) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen Paul Subject: Re: MA EVENT Date: Sun, 04 Jan 1998 02:38:31 -0800 I now have checked with my girlfriend and I'm not as crazy as I thought... we actually had a quake down here in So. CA over two hours later... Could these possibly be related? Kate Hutton would tell me that there's no relationship as they're too far away from each other... but I wonder... there's that ringing bell again? -- Stephen :^) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Robert L Barns <75612.2635@..............> Subject: STM-8 documents Date: Sun, 4 Jan 1998 09:49:55 -0500 Sean-Thomas, I would suggest staying with .GIF format since more people can easliy view this brand of graphics. Bob Barns _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: watson@................ (Charles Watson) Subject: Fwd: Caltech's CMT for the Loyality Is. quake Date: Sun, 04 Jan 1998 08:12:41 -0700 Attached below is Caltech's Automatic Centroid Moment Tensor solution for the Loyalty Islands event. It was centered pretty darn close to the intersection of the Hebrides subduction zone and the Hunter Ridge. The orientation of the focal mechanism, however, suggests a better relationship with the Hunter Ridge zone. There was a M7.7 near here on May 16, 1995 - centered slightly closer to Walpole Island. -- ---/---- Charles P. Watson, Consulting Geologist Advanced Geologic Exploration Seismo-Watch / Earthquake Information Services Voice: 702-852-0992 / Fax: 702-852-3226 Office Location: 39.43N 119.71W mailto:watson@................ http://www.seismo-watch.com From: "Martin Brewer" Subject: Re: MA EVENT Date: Sun, 4 Jan 1998 00:20:33 -0400 Hello All, Bermuda recorded the Loyalty Islands Region earthquake at a distance of 130 degrees away. What appears to be a SkP arrived at 06:34:33. There was no obvious P wave equivalent. Martin _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: VBB integrator Date: Sun, 4 Jan 1998 11:02:32 -0600 (CST) Barry, I forgot to mention one detail about the integrator: why I use a non-inverting configuration: For the VBB feedback, the integral feedback thru RI can not be inverted with respect to the proportional or differential feedbacks, so if an inverting integrator is used, an additional inverter amp is required between the displacement transducer amp/filter and the inverted integrator input. (This is done on commercial units that provide a full differential output of the VBB signal for 1 bit more of dynamic range.) I stay with a "single ended" system for simplicity. Regards, Sean-THomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: MA EVENT Date: Sun, 04 Jan 1998 09:05:57 -0800 Stephen -- I just uploaded my event file for your felt earthquake... 98/01/04 09:11:45 34.20N 118.62W 0.0 3.2ML 1 mi W of CANOGA PARK Karl Cunningham La Mesa, CA. PSN Station #40 karlc@....... At 02:13 AM 1/4/98 -0800, Stephen Paul wrote: > Larry, did you or nyone else pick up something around 1-1:30 PST? I felt a >fairly muted but strong tremor in the Sherman Oaks area of So. CA this >morning, and went online a bit later to see if there was any news, and lo and >behold, you magic Indians had your ears to the ground! Not surprising, I was >just wondering if this might be related... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: frankcnd@.......... (Frank Condon) Subject: The Current Status of Mammoth Date: Sun, 4 Jan 1998 10:51:27 -0800 (PST) Hello All: Here is the latest information about the CURRENT CONDITION of the Mammoth Lakes (Long Valley) caldera as posted by the USGS on their Web Site. ---------------------------------------------------------- Caldera activity: Earthquake activity within the caldera over the past 24 hours included four earthquakes with magnitudes greater than M=3.0. On the evening of the 3rd, M=3.6 and M=3.4 events at 10:19 PM and 10:25 PM, respectively, were located 5 miles east of Mammoth Lakes (near the mouth of Fumarole Valley). On the morning of the 4th, M=3.2 and M=3.6 events at 4:29 AM and 4:34 AM, respectively, were located 2 miles ESE of Mammoth Lakes. All together, 306 earthquakes were detected and located by the realtime computer system over the past 24 hours. Seventeen of these (including the four M>3 earthquakes) had magnitudes of M=2.5 or greater. Most of these earthquakes were located in the south moat from the vicinity of fish hatchery to east of the airport (5 to 7 miles E of Mammoth Lakes) with a smaller number in a cluster just 2 miles ESE of Mammoth Lakes. The resurgent dome continues to inflate at about the same rate as observed in late-October and early November. ---------------------------------------------------------- Frank Condon mail to:frankcnd@.......... "Located in the seismic corridor somewhere between Fontana & Mammoth Lakes" _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Marnie Gannon Subject: ISAIAH AUTOMATIC DATA SUMMARY FOR EVENT ID=9038429 Date: Sun, 04 Jan 1998 12:47:11 -0700 Hey Guys, could you tell me what this is, in easy speak? Thanks, Marnie http://www-socal.wr.usgs.gov/given/review/quakes/9038429_sum.html From: shammon1@............. Subject: Re: ISAIAH AUTOMATIC DATA SUMMARY FOR EVENT ID=9038429 Date: Sun, 04 Jan 1998 14:53:30 -0800 This is the Southern Californa automatic earthquake locator system. It is an example of the state of the art in cool web pages. Take a look at http://www-socal.wr.usgs.gov/given/review/quakes/9038516_sum.html because it also includes the event data which is missing on the URL you posted. I'm told that it is also tied to a pager system but I've yet to so one. Maybe somebody has more information. Regards, Steve Hammond PSN BBS San Jose Marnie Gannon wrote: > > Hey Guys, could you tell me what this is, in easy speak? > Thanks, Marnie > http://www-socal.wr.usgs.gov/given/review/quakes/9038429_sum.html > > --------------------------------------------------------------- > > ISAIAH AUTOMATIC DATA SUMMARY FOR EVENT ID=9038429 > > ON THIS PAGE, JUMP TO... > > [Seismograms] [Notification Message] [Solution Output] [Phase Listing] > [Return to TOP] > > [BACK TO EARTHQUAKE LIST] > > Seismograms of closest stations (sorted by distance) > ---------------------------------------------------------------------- > > [Image] > > WHAT THE PLOT SHOWS: > > * Closest 15 sites with phase picks > * 60 Seconds of time > * Event origin time is 10 sec after beginning of plot > > [Seismograms] [Notification Message] [Solution Output] [Phase Listing] > [Return to TOP] > > [BACK TO EARTHQUAKE LIST] > > ---------------------------------------------------------------------- > > Notification message > > ---------------------------------------------------------------------- > > == PRELIMINARY REPORT OF SIGNIFICANT EVENT == > Southern California Seismographic Network operated by USGS and Caltech > (This is a computer generated solution and has not been reviewed by a human) > > Event Date and Time : 04-JAN-1998 09:32:40.5 gmt (04-JAN 01:32:40.5 pst) > Preliminary Magnitude: 2.2 MGN > Preliminary Location : 35 deg. 37.0 min. > -120 deg. 30.4 min. -6.0 km depth > > Event ID #: 9038429 , 8 phases used, RMS = 0.63 ERH = 2.50 ERZ = 52.50 > > 20 mi. SSW of PARKFIELD > 168 mi. NW of PASADENA > 14 mi. NNE of SANTA-MARGARITA (quarry) > 21 mi. S of Parkfield EQ (28 JUN 1966, 5.6) > 9 mi. WNW of the RINCONADA FAULT > > [Seismograms] [Notification Message] [Solution Output] [Phase Listing] > [Return to TOP] > > [BACK TO EARTHQUAKE LIST] > > ---------------------------------------------------------------------- > > HYPOINVERSE solution output > > ---------------------------------------------------------------------- > > ERROR ELLIPSE: -< 52.50 0 90>-< 2.50 226 0>-< 1.77 316 0> > ------------------------------------------------------------------------------------ > YR MO DA --ORIGIN-- --LAT N- --LON W-- DEPTH RMS ERH ERZ XMAG FMAG > 98- 1- 4 0932 40.48 35 36.99 120 30.40 6.00 0.63 2.50 52.50 > SOURCE > NSTA NPHS DMIN MODEL GAP ITR NFM NWR NWS NVR REMRKS N.XMG-XMMAD-T N.FMG-FMMAD-T L F X > 11 11 50.7 HAD 121 14 0 8 0 11 - 0.00 0.00 0.00 0.00 > REGION= FALX LOCATION: 9038429 > > STA CR DIST AZM AN P/S WT SEC (TOBS -TCAL -DLY =RES) WT SR INFO CAL DUR-W-FMAG-T AMP-PER-W-XMAG-T RMK > PBI 50.7 176 90 P 49.71 9.23 8.53 0.00 0.70* 1.05 0.313 > PSM 51.0 351 90 P 1 50.43 9.95 8.58 0.00 1.37* 0.66 0.240 > PPB 52.3 221 90 P 49.65 9.17 8.79 0.00 0.38 1.05 0.472 > YEG 53.3 112 90 P 49.67 9.19 8.94 0.00 0.25 1.05 0.705 > SIM 54.8 122 90 P 49.66 9.18 9.18 0.00 0.00 1.05 0.930 > PHC 58.9 278 90 P 49.65 9.17 9.84 0.00 -0.67* 1.05 0.470 > PRI 60.1 347 90 P 50.37 9.89 10.03 0.00 -0.14 1.05 0.580 > BCH 61.2 141 90 P 49.68 9.20 10.20 0.00 -1.00* 1.05 0.286 > PTQ 115.3 183 90 S 70.55 30.07 33.43 0.00 -3.36* 0.00S 0.000 > MTU 261.0 42 53 P 70.59 30.11 38.53 0.00 -8.42* 0.00 0.000 > MTC 263.9 31 53 P 70.67 30.19 38.90 0.00 -8.71* 0.00 0.000 > > [Seismograms] [Notification Message] [Solution Output] [Phase Listing] > [Return to TOP] > > [BACK TO EARTHQUAKE LIST] > > ---------------------------------------------------------------------- > > Phase picks (HYPOINVERSE format) > > ---------------------------------------------------------------------- > > PHC IPU0 98 1 4 93249.65 P VHZ 1225 0 > PPB IPD0 98 1 4 93249.65 P VHZ 1094 0 > YEG IPD0 98 1 4 93249.67 P VHZ 952 0 > SIM IPU0 98 1 4 93249.66 P VHZ 742 0 > BCH IPU0 98 1 4 93249.68 P VHZ 1026 0 > PBI IPU0 98 1 4 93249.71 P VHZ 2132 0 > PSM IPU1 98 1 4 93250.43 P VHZ 625 0 > PRI IPD0 98 1 4 93250.37 P VHZ 1019 0 > PTQ 98 1 4 933 10.55ISD0 S VHZ 1322 0 > MTC IPU0 98 1 4 93310.67 P VLZ 1722 0 > MTU IPU0 98 1 4 93310.59 P VHZ 767 0 > 932404835 3699120 3040 6.00 9038429 9038429 0.00 > > [Seismograms] [Notification Message] [Solution Output] [Phase Listing] > [Return to TOP] > > [BACK TO EARTHQUAKE LIST] > > ---------------------------------------------------------------------- > [Image] Return to USGS homepage _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen Caruso Subject: Re: ISAIAH AUTOMATIC DATA SUMMARY FOR EVENT ID=9038429 Date: Sun, 4 Jan 1998 19:54:07 -0500 (EST) Marnie, I don't know if anybody else has a problem with your message (if they don't then ignore this one)but there is alot of html language aboard. I have noticed an html option in the software but if that's what you intended I'll have to load it into a browser off this 8088. Thanks for the bandwidth. STEPHEN CARUSO CET KB8UGH "Coincidence is a shortsighted mental delusion" _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen Caruso Subject: Re: ISAIAH AUTOMATIC DATA SUMMARY FOR EVENT ID=9038429 Date: Sun, 4 Jan 1998 20:20:39 -0500 (EST) Don't get me wrong, I am enthused w/every PSN message. I just thought you weren't aware of what was coming across the net. Thanks for posting.:^) STEPHEN CARUSO CET KB8UGH "Coincidence is a shortsighted mental delusion" _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Trading Post? Date: Sun, 04 Jan 1998 20:19:39 -0700 Hi everyone, This is tentative in thought...Is anyone interested in trading whatever for whatever?? I know for myself... I have a surplus of old stuff I'll likely never get around to using. Expect there is afew out there in the same surplus condition, who would treasure someone else's endless storage goodies. This avocation cost can be considerable over a period of time and a swap may bring a faster and cheaper solution than commercial approaches. Guess it would be fun too. I'am sure that an endless email approach is not desired over the PSN machine. Perhaps, for those interested they could privately communicate outside PSN per their own individual email. It should be possible to make it a swap only....no cash involved....except for postage costs. Anyway....being as this is just a thought...what do you think? Rules? Limitations? Gone Fishing in this PSN pond.........?? Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Marnie Gannon Subject: Re: ISAIAH AUTOMATIC DATA SUMMARY FOR EVENT ID=9038429 Date: Sun, 04 Jan 1998 21:23:46 -0700 Stephen Caruso wrote: > > Don't get me wrong, I am enthused w/every PSN message. I just thought you > weren't aware of what was coming across the net. Thanks for posting.:^) Sorry, you guys, for some reason the seismogram didn't send on the page link..What it was..not what is showing in your post, was a series of tremors on one 60 second plot..I think it showed about 4 8-10 second events, separated by smaller periods with no signal at all..each of the tremors seemed to have its own p wave, not sure about s.. Darn, wish I could show it to you. The entire quake has been deleted now... so I can't send it as a link or anything. Still about 70 or so deleted links on the page for Parkfield and San Luis Obispo quakes...I'm assuming these are bad locations for Mammoth quakes... The ISAIAH site is great..I refer to it often, just lately alot of odd links, deleted, etc.. You hadtohavebeenthere I guess! Sorry about the posting snafu.. Marnie _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: kathy mortensen Subject: DATAQ DI-150RS Date: Sun, 04 Jan 1998 21:01:09 -0700 O.K. I just found the PSN mailing list about 3 weeks ago and have been glued to my email. I was intriged with Sean Thomas Idea of using the Radio Shack dvm as a data recorder. I've been looking for an economical way to record my seimograph signals. When I checked with Radio Shack I discovered their data logger. I ordered it and received it on the 9th working day (UPS) the day before new years eve. You know what I've been doing ---no partying--- !!! I did learn a lot about com ports and IRQs!! With a mouse on com-1 IRQ-4 and a modem on com-2 IRQ-3, both activated in windows, I was stuck!! I tried ever combination of com amd IRQs --- with lockup,lockup,lockup#!%@ I down loaded the sample qbasic program from the dataq web site and finally got it to respond --- sometimes --- . It sometimes missed the respond signal and would --guess what-- yes, lockup#%$#@! Next I decided to disable the modem in windows -- we won't go into that story. The easy way turned out to be to load a short version of windows into a separate directory ---fun,fun,fun%$#@! loaded the dataq software --- guess what -- does not respond!!! FINALLY to the point of this story!! I downloaded the latest software from their web site (as they put it - if you have problems) daaa!! YES,YES,YES --- it works!!! The best data logger I ever had --- of course it is also the worst -- it's the only one!!! I have nothing to compare it to!!! At this point I suspect that I am not compatible with anyone!! At last I can record waveforms. I was on line when the loyalty set off my alarm but I was in the standby mode %$#@#$!!!! but I did catch the end of it and the two mammoths at approx. 4:30 A.M. A long story but hopefully helpful to anyone considering getting a DATAQ. Stephen K. Mortensen here after SKM email mortskm@....... Pilot Hill, Calif. USA _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: RADIOTEL Subject: Re: Trading Post? Date: Mon, 5 Jan 1998 00:41:37 EST MEREDITH LAMB Your trading post idea is great. I say lets go for it. Jim Allen Cerritos, California _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Norman Davis WB6SHI Subject: Re: DATAQ DI-150RS Date: Sun, 04 Jan 1998 22:44:23 I was intriged with Sean Thomas Idea of using the Radio Shack >dvm as a data >recorder. I have been using the rs dvm for loging for a while now and find the sapling rate to slow. 1 sec but it does work and is great for trouble shooting and designing amps and filters. I and mike d have been thinking of the dataq modual for this purpose and intersted in your post. > I was on line when the loyalty set off my alarm but I was >in the standby >mode %$#@#$!!!! but I did catch the end of it and the two mammoths at >approx. 4:30 A.M. What is loyalty?? >A long story but hopefully helpful to anyone considering getting a >DATAQ. I could use it for other stuff like radio astomomy and weather data but think I will put any further money into a good adc board as then I can use a program like emon or sdr. Norman Davis WB6SHI Email normd@............. Shingle Springs, Ca, USA it ain't local... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: PSN records for M. Antolik - Map / MPEG viewers Date: Sun, 04 Jan 1998 23:03:34 -0800 Greetings, Does anyone know of a MPEG viewer that can display the files at the link below. All of the Win95/NT versions I can find on the Net either won't display the pictures correctly or need to be registered to display the large files. While I'm at it... I'm also looking for a good commercial street map program that can be used to display the location of local or regional events. A long time ago I had a Windows 3.1 program called LocalExpert. It was limited in what it could do but was OK for locating local events. It would allow you to draw circles of X diameter so one could plot the event location based on the P and S wave distance from several stations. Unfortunately I lost that program a while back when I had a hard disk crash. I now do regular backups... I now have a program called Precision Mapping 2.0. Its not very good. It only displays distance in miles, no km, and drawing of a circle is real flaky. So if anyone can suggest a good MPEG view and / or map program please let me know. Regards, Larry Cochrane Redwood City, PSN At 02:53 PM 1/2/98 -0700, Edward Cranswick wrote: >PSN members in the San Francisco Bay Area- > 3-dimensional, finite-difference models of seismic wave propagation and >site response in the San Francisco Bay Area created by members of the >Seismic Station at UCB can be seen: > >http://www.seismo.berkeley.edu/seismo/events_of_interest/3dmod/3dmod.html > >-Edward _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: kathy mortensen Subject: Re: DATAQ DI-150RS Date: Sun, 04 Jan 1998 23:35:29 -0700 What is loyalty?? > LOYALTY ISLANDS REGION was the reference that USGS gave for a 7.0 earthquake N.E. of astralia -- 22.17S, 170.51E Jan 4 06:11:50 1998 GMT About 6,100 miles from here! > Norman Davis WB6SHI > Email normd@............. > Shingle Springs, Ca, USA it ain't local... > > _____________________________________________________________________ > > 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: PSN records for M. Antolik - Map / MPEG viewers Date: Mon, 5 Jan 1998 00:06:12 -0800 > -----Original Message----- > From: Larry Cochrane [mailto:cochrane@............... > Sent: Sunday, January 04, 1998 11:04 PM > To: PSN-L Mailing List > Subject: Re: PSN records for M. Antolik - Map / MPEG viewers > > > Greetings, > > Does anyone know of a MPEG viewer that can display the files at the link > below. All of the Win95/NT versions I can find on the Net either won't > display the pictures correctly or need to be registered to display the > large files. > i tried the ones for the hayward fault and found that the smaller two (about ..2 mbyte and .5 mbyte) would run under ie4, but not the larger one...i suspect that updating my version of RUNDLL32 should do it...the updates are usually available at the ms site...i'll let you know if that works...and thanks for the cue to the site...cool movies... frank _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Jim Hannon Subject: Re: PSN records for M. Antolik - Map / MPEG viewers Date: Mon, 05 Jan 1998 05:55:02 -0600 Larry Cochrane wrote: > While I'm at it... I'm also looking for a good commercial street map > program that can be used to display the location of local or regional > events. A long time ago I had a Windows 3.1 program called LocalExpert. It > was limited in what it could do but was OK for locating local events. It > would allow you to draw circles of X diameter so one could plot the event > location based on the P and S wave distance from several stations. > Unfortunately I lost that program a while back when I had a hard disk > crash. I now do regular backups... I now have a program called Precision > Mapping 2.0. Its not very good. It only displays distance in miles, no km, > and drawing of a circle is real flaky. > > So if anyone can suggest a good MPEG view and / or map program please let > me know. > > Regards, > Larry Cochrane > Redwood City, PSN Larry, We have been using software and data from DeLorme Mapping Co. at work for our GPS tracking system. I can find out more about how well it works today from the guys that are actually using it. -- Jim Hannon http://soli.inav.net/~jmhannon/ 42,11.90N 91,39.26W WB0TXL _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "frank murray" Subject: anything at 12:50 UTC??... Date: Mon, 5 Jan 1998 05:15:25 -0800 did anyone pick up something just prior to 12:50 UTC on 1/5/98??... frank _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: ralvarez@........ (Raul Alvarez) Subject: Re: Trading Post? Date: Mon, 5 Jan 1998 06:34:06 -0700 (MST) Greetings! Great idea!! I sure have a lot of junk, er, treasure, I can swap. Why not also post your needed items? Raul >Hi everyone, > >This is tentative in thought...Is anyone interested in trading >whatever for whatever?? I know for myself... I have a >surplus of old stuff I'll likely never get around to using. > >Expect there is afew out there in the same surplus condition, >who would treasure someone else's endless storage goodies. > >This avocation cost can be considerable over a period of >time and a swap may bring a faster and cheaper solution >than commercial approaches. Guess it would be fun too. > >I'am sure that an endless email approach is not desired over >the PSN machine. Perhaps, for those interested they >could privately communicate outside PSN per their own >individual email. It should be possible to make it a swap >only....no cash involved....except for postage costs. > >Anyway....being as this is just a thought...what do you >think? Rules? Limitations? Gone Fishing in this PSN >pond.........?? > >Thanks, Meredith Lamb > > > > > > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~ ~ ~ "My dreams are the seeds of my reality, ~ ~ nurtured in the womb of my soul" ~ ~ RJA, 1985 ~ ~ ~ ~ ~ ~ Raul J. Alvarez ~ ~ Bellvue, Colorado ~ ~ e-mail ralvarez@........ ~ ~ homepage www.frii.com/~ralvarez ~ ~ "The Renaissance Experimenter" ~ ~ experimenter in: ~ ~ Radio and Optical Astronomy, Seismology, Weather, ~ ~ Computers, Instrumentation and Neat Stuff! ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Mike Lozano Subject: Re:Trading Post! Date: Mon, 05 Jan 1998 08:54:54 -0600 Hi guys! Trading post sounds like a great idea! Why don't I kick things off with two offerings: 1 ea. FastVac DV-85/DV-142 Series Deep Vacuum Pump BRAND NEW - NEVER EVEN PLUGGED IN! with spare Wankel-type cylinder replacement kit (still in box), and 1 Qt. of oil (still sealed). Purchased for around $400 for a project that never got off the ground. Great for micro-barometry experimenters! 2 ea. DRSI Micro Data Link Controllers (packet radio system) Licensed on commercial itinerant frequency in the 460 MHz band (5 watt transmitter and cut-to-frequency rubber duck antennas on BNC connectors. This system uses commercial packet standard, and is not easily compatible with amateur packet. Used, but in MINT condition. Purchased for around $1500. Set up your own remote seismic station! Mike Lozano, N0BDF mikel@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: watson@................ (Charles Watson) Subject: Re: ISAIAH AUTOMATIC DATA SUMMARY FOR EVENT ID=9038429 Date: Mon, 05 Jan 1998 07:35:27 -0700 Stephen Caruso wrote: > > Don't get me wrong, I am enthused w/every PSN message. I just thought you > weren't aware of what was coming across the net. Thanks for posting.:^ I can understand your frustration, Steve. It has been my experience that different web browsers interpret web sites differently and it is the same for e-mail readers as well. When Marnie attaches the html document, many modern e-mail readers, like Netscape, Explorer, Claris, etc., can interpret the html language and format the message in a full html document with font enhancements, links and graphics. Quite a wonderful invention, really! I used it extensively when publishing Seismo-Watch Earthquake Alert Bulletins via e-mail. However, the draw back is many people do not use these modern e-mail readers and it can be a bother when all they see is a bunch of html scripting. They really don't know what they are missing and it can be frustrating to get all the gibberish html. I have found it is best when passing information from other web sites to simply provide the html link and if people are really interested, they can go to the web site and see it for themselves. Cheers! -- ---/---- Charles P. Watson, Consulting Geologist Advanced Geologic Exploration Seismo-Watch / Earthquake Information Services Voice: 702-852-0992 / Fax: 702-852-3226 Office Location: 39.43N 119.71W mailto:watson@................ http://www.seismo-watch.com _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Norman Davis WB6SHI Subject: Re: PSN records for M. Antolik - Map / MPEG viewers Date: Mon, 05 Jan 1998 07:31:27 >While I'm at it... I'm also looking for a good commercial street map >program that can be used to display the location of local or regional >events. A long time ago I had a Windows 3.1 program called LocalExpert. It >was limited in what it could do but was OK for locating local events. It >would allow you to draw circles of X diameter so one could plot the event >location based on the P and S wave distance from several stations. >Unfortunately I lost that program a while back when I had a hard disk >crash. I now do regular backups... I now have a program called Precision >Mapping 2.0. Its not very good. It only displays distance in miles, no km, I have the newer version 3.0 it and it seems to me that it will do km and the circles look good, IMHO. Norm Norman Davis WB6SHI Email normd@............. Shingle Springs, Ca, USA it ain't local... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: watson@................ (Charles Watson) Subject: Re: Trading Post! Date: Mon, 05 Jan 1998 07:57:37 -0700 Hey this is a great idea! Maybe a web page could be set up at the PSN web site that could deal with these "treasures". Call it the "PSN Trading Post". -- ---/---- Charles P. Watson, Consulting Geologist Advanced Geologic Exploration Seismo-Watch / Earthquake Information Services Voice: 702-852-0992 / Fax: 702-852-3226 Office Location: 39.43N 119.71W mailto:watson@................ http://www.seismo-watch.com _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: PSN records for M. Antolik - Map / MPEG viewers Date: Mon, 05 Jan 1998 09:44:12 -0700 Larry- I think that I am using a plugin from Intervu, http://www.intervu.net/ though I am somewhat confused about what is going on when I try to track down the details of my instalation of Netscape Navigator Gold ver 3.01. -Edward Larry Cochrane wrote: > > Greetings, > > Does anyone know of a MPEG viewer that can display the files at the link > below. All of the Win95/NT versions I can find on the Net either won't > display the pictures correctly or need to be registered to display the > large files. -- 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: dean sevold Subject: Fwd: Meteorite News Date: Mon, 05 Jan 98 08:49:27 PST Date: Sun, 04 Jan 98 16:11:05 PST From: Klaus Georg Hansen To: dean sevold Subject: Meteorite News Dear Dean Last news from Greenland (KNR): Today (4th) 10.000 km2 has been overflewn by an airplane with the special radar. On the plane were a crew of 11 specialists. The area overflewn is between Groennedal to the south and Nuuk to the north. Radar operator Soeren Madsen Danish Technical University told KNR they saw nothing from the plane that with certainty was a meteorite, but something might be interpreted as a strike area. Now all the data from the radar must be analysed on computers in Denmark before anytning new can be said. These analysis might last for a week or so. Klaus Georg Hansen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Marnie Gannon Subject: Re: PSN records for M. Antolik - Map / MPEG viewers Date: Mon, 05 Jan 1998 10:04:31 -0700 Edward Cranswick wrote: > > Larry- > I think that I am using a plugin from Intervu, > > http://www.intervu.net/ Edward, Just went over and looked at the site. Do you find it true that it speeds graphics downloads by two or three times? Marnie _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: ERICH777 Subject: Event So CA Date: Mon, 5 Jan 1998 13:20:31 EST To : psn-l@............. Subject: Time: Date: Jan 5 approx 10 :14 Station Location 33,51.00N 118,8.33W Remarks; P to S 24 miles away A n George Erich ~~~~~~~|~~~~~~~~~~/~~~~~ Seismic Exploration Consulting Services '' ' ' ' ' ' ' 'O' " ' ' ' ' '` ' ' ' ' /' ' ' ' ' ' ' P. O. Box 2011 ` ` ` ` ` ` ` \ ` ` `` ` ' '` ` / ` ` ` ` ` ` Norwalk, CA 90651-2011 USA . . . . . . . . \ . . . . . . / . . . . . . - - - - - - - - -\ - - - - -/ - - - - - - - Telephone (562) 868-6013 : : : : : : : : : \ : :' ::/ : : : : : : : e-mail GeE777@....... \ / ' ' ' ' ' ' ' ' ' ' ' ' '.\ ' / " " " " " " " Psalms 85:11 Truth shall spring out of the earth; . . . .. ___V___________ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: ERICH777 Subject: Re; Geophone Date: Mon, 5 Jan 1998 13:12:05 EST Hi all Date: 98-01-03 18:49:16 EST normd@............. (Norman Davis WB6SHI) writes; << I just got a copy of rtclark cataloge. There are two types of geophones. One is called shearwave and the other nothing. I asume the lower freq the better.>> I have used the GSC-11D geophone in work with exploration seismology. Don't worry about soldering, I'ts made for that. The notrhing is a vertical phone. I suggest RT Ckark used seismic equipment catalog at ( rtclark@........... ) for inexpensive equipment. Remember, most of their stuff is for seismic exploration and they record higher frequency seismic signals. A n George Erich ~~~~~~~|~~~~~~~~~~/~~~~~ Seismic Exploration Consulting Services '' ' ' ' ' ' ' 'O' " ' ' ' ' '` ' ' ' ' /' ' ' ' ' ' ' P. O. Box 2011 ` ` ` ` ` ` ` \ ` ` `` ` ' '` ` / ` ` ` ` ` ` Norwalk, CA 90651-2011 USA . . . . . . . . \ . . . . . . / . . . . . . - - - - - - - - -\ - - - - -/ - - - - - - - Telephone (562) 868-6013 : : : : : : : : : \ : :' ::/ : : : : : : : e-mail GeE777@....... \ / e-mail ERICH777@....... ' ' ' ' ' ' ' ' ' ' ' ' '.\ ' / " " " " " " " Psalms 85:11 Truth shall spring out of the earth; . . . .. ___V___________ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "frank murray" Subject: RE: Event So CA Date: Mon, 5 Jan 1998 10:52:04 -0800 this from usgs: 98/01/05 18:14:06 33.94N 117.71W 7.8 4.3Ml SOUTHERN CALIFORNIA > -----Original Message----- > From: ERICH777 [mailto:ERICH777@........ > Sent: Monday, January 05, 1998 10:21 AM > To: psn-l@............. > Subject: Event So CA > > > To : > psn-l@............. > Subject: > Time: > > Date: Jan 5 approx 10 :14 > > > Station Location > 33,51.00N > 118,8.33W > > Remarks; > P to S 24 miles away > > > A n > George Erich > ~~~~~~~|~~~~~~~~~~/~~~~~ > Seismic Exploration Consulting Services '' ' ' ' ' ' ' 'O' " ' ' ' ' '` > ' ' ' ' /' ' ' ' ' ' ' > P. O. Box 2011 ` ` ` ` ` ` ` \ ` ` > `` ` ' '` ` / ` ` ` ` ` ` > Norwalk, CA 90651-2011 USA . . . . . . . . \ . . . . .. . > / . . . . . . > - - - - - - > - - -\ - - - - -/ - - - - - - - > Telephone (562) 868-6013 : : : : : : : : : \ : :' > ::/ : : : : : : : > e-mail GeE777@....... \ / > ' ' ' ' ' ' > ' ' ' ' ' ' '.\ ' / " " " " " " " > Psalms 85:11 Truth shall spring out of the earth; . . . .. ___V___________ > > > > _____________________________________________________________________ > > 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@................. (Bob Hammond (USGS-AVO Geophysicist)) Subject: Re: Geophone Date: Mon, 5 Jan 1998 09:51:54 -0900 Norman Davis, et al: I use a Mark Products L4 geophone which is sold by the RT Clark, Co. I suggest using this geophone as a short-period vertical sensor for amateur seismographs because it a 1-Hz seismometer, has good response, and is used by virtually all of the university and government seismograph networks in the US. Keep in mind that geophones normally used in oil exploration are 2 Hz geophones and are not as good for monitoring regional and local earthquakes as a 1 Hz instrument. The L4 comes with a calibration coil and is marked as a L4-C. You don't need the cal coil. regards, Bob Hammond APSN Fairbanks (- 43F this morning) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: PSN records for M. Antolik - Map / MPEG viewers Date: Mon, 05 Jan 1998 12:16:37 -0700 Marnie- I don't know, i.e., I have not done any benchmark tests; against what? -Edward Marnie Gannon wrote: > > Edward Cranswick wrote: > > > > Larry- > > I think that I am using a plugin from Intervu, > > > > http://www.intervu.net/ > > Edward, > > Just went over and looked at the site. Do you find it true that it > speeds graphics downloads by two or three times? > > Marnie > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- 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 Paul Subject: Re: MA EVENT Date: Mon, 05 Jan 1998 10:36:03 -0800 Karl Cunningham wrote: > Stephen -- > > I just uploaded my event file for your felt earthquake... > > 98/01/04 09:11:45 34.20N 118.62W 0.0 3.2ML 1 mi W of CANOGA PARK > > Karl Cunningham > La Mesa, CA. > PSN Station #40 > karlc@....... > > At 02:13 AM 1/4/98 -0800, Stephen Paul wrote: > > Larry, did you or nyone else pick up something around 1-1:30 PST? I felt a > >fairly muted but strong tremor in the Sherman Oaks area of So. CA this > >morning, and went online a bit later to see if there was any news, and lo and > >behold, you magic Indians had your ears to the ground! Not surprising, I was > >just wondering if this might be related... > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L Thanks Karl... I'm really beginning to suspect the interrelatedness of these events all over the world, and most especially on the opposite sides of the rim. We had a real shaker again this morning at about 02:20 UTC. Preliminary reports I've seen say it was a 4.1 centered in Chino, CA... I suspect it isn't the end... my house felt like a 747 landing for close to 30-45 seconds! Apparently this one was widely felt... There are so many fractures down here that sometimes it's hard to tell just what is happening, i.e. is it a big one far off or a small one close by? A lot depends on how the P wave feels. The sharper the jolt, the closer it usually is. But I guess the length of duration of the S is what causes the mondo damage. And Italy seems to be still having more than its share of woes. Did you happen to map this morning's event? Appreciate the reply. Thanks. -- Stephen :^) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen Paul Subject: Re: PSN records for M. Antolik - Map / MPEG viewers Date: Mon, 05 Jan 1998 11:11:27 -0800 Larry Cochrane wrote: > Greetings, > > Does anyone know of a MPEG viewer that can display the files at the link > below. All of the Win95/NT versions I can find on the Net either won't > display the pictures correctly or need to be registered to display the > large files. > > While I'm at it... I'm also looking for a good commercial street map > program that can be used to display the location of local or regional > events. A long time ago I had a Windows 3.1 program called LocalExpert. It > was limited in what it could do but was OK for locating local events. It > would allow you to draw circles of X diameter so one could plot the event > location based on the P and S wave distance from several stations. > Unfortunately I lost that program a while back when I had a hard disk > crash. I now do regular backups... I now have a program called Precision > Mapping 2.0. Its not very good. It only displays distance in miles, no km, > and drawing of a circle is real flaky. > > So if anyone can suggest a good MPEG view and / or map program please let > me know. > > Regards, > Larry Cochrane > Redwood City, PSN > > At 02:53 PM 1/2/98 -0700, Edward Cranswick wrote: > >PSN members in the San Francisco Bay Area- > > 3-dimensional, finite-difference models of seismic wave propagation and > >site response in the San Francisco Bay Area created by members of the > >Seismic Station at UCB can be seen: > > > >http://www.seismo.berkeley.edu/seismo/e