SAC Help

A forum for SAC users to exchange ideas and ask questions about SAC usage, installation, portability, etc.

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Active Message Threads for January 2012

maytalsadeh@post.tau.ac.il
2012-01-30 01:17:23 - 2012-01-30 06:19:48
Hi, I am very new to sac (and a bit to seismology in general) and have started experimenting with sac. one of my header lines is: IDEP = JSOP I didn't find any reference for JSOP. Any ideas what that could be? Thanks
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Jose Rial
2012-01-26 19:27:42
Has anyone had problems running SAC on Lion? I have, plenty... Lately, it has been running but I know it'll crash either when I want to plot anything using p. I get tons of unrequested comments as I am processing data, such as setcolor3:0 0 [default] This appears after almost every command. Then, it suddenly, and for no apparent reason, crashes, like this SAC> r curt curtnoint SAC> p2 SAC> r curt SAC> p sac(1081) malloc: *** error for object 0x1008107a0: incorrect checksum for freed obj... [more]
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Arthur Snoke
2012-01-25 23:13:49
Jose, I got temporary access to a OS10.7.2 machine but had no problems. I had sent out a "beta" version of v101.5, and I think someone wrote back that it had worked okay for them on OS 10.7.2. Still, it is not working for you, so we need to figure out the reason. Please repeat the steps I do below and make a file of the screen interactions and send it to me. Important questions are the version of gcc you are using. (The one here is the defalt that comes with xcode -- which was put o... [more]
No replies
jose rial
2012-01-25 01:01:18 - 2012-01-25 01:32:11
Hi; I'm running SAC on Mac OSX 10.7.2 and thought it installed correctly and seems to work OK, it crashes a lot. It crashes sometimes as in the example below after seemingly routine commands, like read and plot. Sometimes it crashes for a segmentation fault, without apparent motive, just when plot is invoked. SAC> lp co .001 n 4 p 2 SAC> p SAC> xlim 8000 20000 SAC> p SAC> ls 159.18E 72.82S.txt TALDICE_18O_TALDICE1_8-25ka.txt HP [Converted].jpg cu... [more]
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Sheila Peacock
2012-01-23 19:18:12 - 2012-01-25 00:17:47
Caroline Holden wrote, on 20th January 2012: Hello, could you please let me know what would be the sac polezero file for a Milne-Shaw instrument with the following characteristics: Seismometer period Ts=12 Damping ratio 20:1 Magnification 250 Thank you very much for your help! Caroline PS: my guess is: Zero 2 poles 2 -0.3613 0.3790 -0.3613 0.3790 Constant 250*2*pi I looked up in Scherbaum ("Of Poles and Zeros", Kluwer, 2001) and found the following. First of all, the second pole m... [more]
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Steve Gao
2012-01-21 15:43:15 - 2012-01-22 04:51:47
Hi, My understanding was that wsac1 keeps all the header values from the most recent rsac1 call? However, in the following example, file tmp1.z lost all its event/station coordinates and related headers. Any hints? Thanks. Steve Gao ------------------------------------ nin1='tmp.z' call rsac1(nin1, x, npts, beg, delta, max, nerr) nin1='tmp1.z' call wsac1(nin1, x, npts, beg, delta, nerr)
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Caroline Holden
2012-01-21 01:44:02
Hello, could you please let me know what would be the sac polezero file for a Milne-Shaw instrument with the following characteristics: Seismometer period Ts=12 Damping ratio 20:1 Magnification 250 Thank you very much for your help! Caroline PS: my guess is: Zero 2 poles 2 -0.3613 0.3790 -0.3613 0.3790 Constant 250*2*pi Notice: This email and any attachments are confidential. If received in error please destroy and immediately notify us. Do not copy or disclose the contents.
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Geo .
2012-01-17 06:50:44
Hello, I have converted velocity seismograms to displacement and I see that header GCARC are not the same. I haven't checked other headers at this time. In one case, the difference was ~7 degrees. Is there a reason for this? How do I mitigate this problem. Thanks for your time! Januka.
No replies
weitao
2012-01-08 23:49:43 - 2012-01-09 00:57:24
Hi everyone, I recently update sac into sac 101.5 on centos6.2 and centos 5.5, both 32bit and encountered problems while changing headers using "ch ", as described bellow. cat <<EOF >test.sh funcgen seis w demo.sac rh demo.sac ch t1 12.0 wh r demo.sac lh t1 q EOF sac < test.sh As shown in my linux, the header t1 do not exist in demo.sac and moreover it seems the waveform has been changed. Is this a bug or it is due to the setup of my linux env? Any advices ? thanks! PS. I use the pre-c... [more]
Rob Casey
2012-01-05 22:09:04
Hi Margaret- This question gets to the heart of the SAC builds themselves, which we do not have control over. We only broker the distribution. I need to forward your question to the SAC HELP list and see if the list members can help you address this. Please consider subscribing to the SAC Help list through the IRIS website where you're sure to get the best expert answers to your SAC questions. -Rob > > Begin forwarded message: > > From: "Doll, Margaret Ann" <margaret_doll@... [more]
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Branden Christensen
2012-01-03 00:54:29
*The Observatorio Sismico del Occidente de Panama (OSOP) is pleased to announce the First SeisComp Workshop for the Americas * * * Date: Sunday, June 3rd to Saturday, June 9th Location: OSOP, Volcan Baru, Panama Application Deadline: March 15th, 2012 Slots: 15 (The first 10 participants will receive free room) Cost: 1,900 USD (includes ice breaker, coffee, snacks, lunch, a gala dinner and RUMBA. Transportation not included.) 2,500 after deadline. *Company Description* OSOP develops, supp... [more]
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*Geophysical Software Developer and Programmer, OSOP, Panama* * * OSOP, located in the highlands of Western Panama, has an opening for a full-time geophysical software developer and programmer. We are looking for an individual who is versed in geophysical signal processing and at-home in the Linux environment. *Company Description* OSOP provides vertically integrated solutions and turn-key systems for geophysical monitoring. OSOP develops, supports, installs, maintains and configures inst... [more]
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*Electronics Guru and Field System Engineer, OSOP, Panama* OSOP, located in the highlands of Western Panama, has an opening for a full-time electronics specialist and field system engineer. We are looking for someone who can design circuit boards for geophysical applications, is good with their hands and can install geophysical equipment. Knowledge of geophysics is a plus. *Company Description* OSOP provides vertically integrated solutions and turn-key systems for geophysical monitoring. ... [more]
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Sunil .
2012-01-01 20:44:29 - 2012-01-02 02:05:51
Hi SAC user, I am trying to write the complete sac header for evenly space file using wsac0() in c program. But i am always getting error or segmentation fault. The problem is that I am not able to understand what input it is taking to write the complete header information using wsac0() function. what is the 2nd and 3rd input in wsac0(). The code to write the sac file is given here. What is the problem in the code or I would be thankful for your advise to correct the code. int main(int... [more]
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