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 July 2011

Sheila Peacock
2011-07-29 15:35:31
Dear Eric, You need a lot more help and time than I can devote, but here is a start. I hope that other members of this list can point you to web resources (perhaps some that they have written themselves). Regards, Sheila Peacock. -------- Original Message -------- Subject: [SAC-HELP] Help to pick p & s phases, get instrument gain ... Date: Thu, 28 Jul 2011 14:44:14 -0700 (PDT) From: ndoh ndikum <ndikumeric@yahoo.com> Reply-To: ndoh ndikum <ndikumeric@yahoo.com> To: chad@iris.washingt... [more]
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Arthur Snoke
2011-07-29 02:43:03
We are planning to put the message file into a help file, which will then be as well in the online manual. We would appreciate it if folks could look at the file and advise us of any errors, inconsistencies, or omissions. No need to copy the whole list on this. Thanks, Arthur ---------- Forwarded message ---------- Date: Thu, 28 Jul 2011 10:08:41 -0400 From: Brian Savage <savage@uri.edu> To: Andrew Schaeffer <aj.schaeffer@gmail.com> Cc: Sac Help <sac-help@iris.washington.edu> Subject: ... [more]
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(no body)
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Andrew Schaeffer
2011-07-28 16:23:02 - 2011-07-28 17:08:41
Hello, Does anybody know a reference that lists the different error codes and syntax for the C/Fortran library routines packaged with SAC? I didn't see those in the online manual. thanks, Andrew
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Neil Selby
2011-07-25 21:58:44 - 2011-07-26 23:57:45
Hello, hope this gets through! this is an example of the behaviour I described to Sheila: [neil@braeriach scratch]$ /sharedprograms/sac/v101.4/64/sac/bin/sac SEISMIC ANALYSIS CODE [06/07/2010 (Version 101.4)] Copyright 1995 Regents of the University of California SAC> r *SHZ*sac 20020511_000000.EKB10.SHZ.sac 20020511_000000.EKB1.SHZ.sac 20020511_000000.EKB2.SHZ.sac 20020511_000000.EKB3.SHZ.sac 20020511_000000.EKB4.SHZ.sac 20020511_000000.EKB5.SHZ.sac 20020511_000000.EKB6.SHZ.sac 200... [more]
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Sheila Peacock
2011-07-25 15:49:29
My colleague adds that the current IRIS-released version, 101.4, also behaves this way. S. -------- Original Message -------- Subject: [SAC-HELP] Fwd: Re: Fwd: printed comment in transfer command Date: Mon, 25 Jul 2011 08:31:54 +0100 From: Sheila Peacock <sheila@blacknest.gov.uk> Organisation: AWE Blacknest To: sac-help@iris.washington.edu <sac-help@iris.washington.edu> Dear Arthur and All, I got this from my colleague who has been using SAC for a long time. Sheila Peacock. -------- Or... [more]
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Sheila Peacock
2011-07-25 15:31:54
Dear Arthur and All, I got this from my colleague who has been using SAC for a long time. Sheila Peacock. -------- Original Message -------- Subject: Re: Fwd: [SAC-HELP] printed comment in transfer command Date: Mon, 25 Jul 2011 08:27:30 +0100 Sheila, this has probably been answered already. The value is not always "1.0000". On older versions of SAC, if you apply "transfer" to multiple waveforms simultaneously, then all but the first waveform are multiplied by the "scale" value in the ... [more]
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Arthur Snoke
2011-07-25 14:47:58
Is the printout from RTREND of any use? SAC> r ./2006.253.14.59.45.4500.TA.N11A..BHZ.R.SAC SAC> rtrend Slope and standard deviation are: -0.0018373 0.0014481 Intercept and standard deviation are: 375.65 2.1152 Data standard deviation is: 336.38 Data correlation coefficient is: 0.0039891 SAC> My preference would be to not print it out. My second choice would be to have the printout appear only if the call was SAC> RTREND VERBOSE Comments?
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Arthur Snoke
2011-07-20 04:17:34 - 2011-07-22 15:25:16
To my knowledge, since IRIS/SAC v100, EVDP (focal depth in the SAC header) has not been used in any SAC command. Please let me know if there are commands I have overlooked. Because of historical reasons, EVDP (focal depth) in SAC has the units according to the SAC manual. RDSEED converts EVDP from kilometers (which it is in blockette 71 in SEED) to meters when writing SAC waveforms. For v101.5, the units of EVDP will be of interest because we will (re) introduce a version of the TRAV... [more]
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Mehari Melak Ayele (mmayele)
2011-07-22 02:26:31
Mehari M. Ayele (G. Research Assistant) The University of Memphis Center of Earthquake Research and Information 3894 Central Av. St.1 Memphis, TN - 38152, USA Office phone: 901-678-5053 ________________________________________ From: sac-help-bounces@iris.washington.edu [sac-help-bounces@iris.washington.edu] On Behalf Of sac-help-request@iris.washington.edu [sac-help-request@iris.washington.edu] Sent: Thursday, July 21, 2011 6:28 PM To: Mehari Melak Ayele (mmayele) Subject: Welcome to the "sa... [more]
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Mallory A Morell
2011-07-21 19:10:46
Hello! This is Mallory Morell from U of Arizona. I am trying to run this script: #! /bin/csh -f unsetenv CLICOLOR set loc = `pwd` #set stns = `ls -d [A-Z]*/badRF` set stns = `ls -d test*/` foreach stn ( $stns ) cd $stn set files = `ls *a*.norm.itr` foreach ff ( $files ) set fcut = `basename $ff .itr` echo $fcut echo $fcut | sac ../sacro_itr echo -n " move files = 1 >>> " set ans = $< if ( $ans == 1) then mv $fcut* badRF endif en... [more]
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Dan Bassett
2011-07-18 04:57:34
Hello, Just a quick enquiry to see if there are any existing modules or scripts within sac which can be used for the construction of RSAM and SSAM plots from continuous waveform data. Any assistance would be greatly appreciated. Kind Regards' Dan
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James Sokolowski
2011-07-15 23:38:53
Folks, I've placed my "sac" folder in /Applications and am trying to modify my X11 bash shell to enable running SAC. First: There is no ~/.bashrc file on my system, so I vi'd it, added the lines, and wrote it to that location. When I type: " source ~/.bashrc " I get a bunch of: " bash: setenv: command not found " errors. Since my ~/.bashrc file only has the two lines: export SACHOME=/Applications/sac source ${SACHOME}/bin/sacinit.csh I'm not sure why I'm seeing these errors. I'm... [more]
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James T. Rutledge
2011-07-14 16:29:51
I made the mistake of writing a header value to disk of a cut file. Is there anyway to recover the original waveform? The file on disk remains at its original size, but header values are not correct (e.g., NPTS and E). So, any ideas? Thanks, Jim Rutledge ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ TSPA (Technical data or Software Publicly Available) GTDA CORRESPONDENCE
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manhlb
2011-07-14 02:39:18
Dear Everyone I am a beginner in SAC, I have some questions look forward to get your help, 1. I usually use Seisan to locate Earthquake epicenter, Recently I am learning SAC and I don't know Can I use SAC to locate Earthquake epicenter. 2. When I use the SSS command, and use prs command to plot the seismograms with the arrangement depend on the distant from earthquake to the station. next step, I want to plot a stack from all seismograms depend on the travel of Pn or Pg phase, please sho... [more]
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rongwen guo
2011-07-14 00:06:07
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Angela Sarao'
2011-07-13 18:54:20
I'm getting a bus error running a macro, when the correlate master 1 number 350 length 20 instruction is executed to cross correlate two series of 896001 samples each. Tested on Mac OS X 10.5.x and 10.6.x, with 32 and 64 bit Sac v.101.4. Was giving the same error with v.101.3b. RAM on the test machines goes from 3 to 12 GB. If I use only one window, like in correlate master 1 the bus error does not occur. Also, the bus error does not occur if I decimate the samples before cross corr... [more]
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Carl Tape
2011-07-08 20:24:32 - 2011-07-13 04:50:12
Dear sac-help: I am wanting to compare synthetic seismograms computed using a flat-earth model using two different techniques. It seems like it would be easiest to "turn off" the sphericity/ellipticity of the Earth, and then input the source and station locations in, say, km. And then the azimuth and back-azimuth angles would differ by exactly 180 degrees. I do not see a sac header that might do this -- is there a simple solution? Alternatively, it seems I could set LCALDA = false, and then ... [more]
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David Yang
2011-07-13 00:37:57 - 2011-07-13 03:03:26
The "executing other programs from SAC macros" using "run-endrun" does not work for my copy of the SAC, which is version 101.4 on a Mac. I have a macro test.m with the following lines $run ls $endrun and I tried to run it with command SAC> macro test.m It gave me a "Segmentation fault" error. Does anyone know why this happens? Thanks! David Correspondence/TSPA
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rc202388@ucla.edu
2011-07-08 22:23:30
Hello, I am working in 64-bit Linux machine with the most recent version of Ubuntu installed. After retrieving a sac binary file to make a plot, I cannot close the plot whatsoever. Moreover, I cannot change the directory from the one where I retrieved the binary file. Also, when using 'write alpha append .txt' to create a companion text file, does it save it in the same folder with the binary file? Thank you for your help. Raymond Chen
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Metin Kahraman
2011-07-08 19:21:42 - 2011-07-08 20:58:25
Dear SAC users, I run SAC 101.3b under Ubuntu linux. When I read a sac file and plot with p1 command, the pop up waveform window activated but I would like teminal window activated to enter more commands while I am seeing waveform window without click terminal window. Is there anyway do this ? Best wishes, Metin Kahraman
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SUDESH KUMAR
2011-07-08 10:49:19 - 2011-07-08 19:29:22
Dear SAC-users I am picking/marking the phase after opening the OHPF in SAC (ver 101.3b). Earlier also i did the same with older version of SAC (100.0). To my surprise i am getting different formats while working with these versions of SAC. e.g. MTP IPU0  2 1131423 6.00       (using ver 100.0) seems to be fine. MTP IPU0  2 11314236.00        (using ver 101.3b) KBC IPU0  2 1131422666.00     (using ver 101.3b)                    I am not getting any fixed/proper format like earlier versio... [more]
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SUDESH KUMAR
2011-07-08 06:30:47
Dear Sir/Madam I am using SAC for seismological analysis for last two years. Recently I am using sac101.3b and got a problem in HYPO file format, I am unable to follow the format of case1.             case1   AMT IPU0  9 3161424338.00       345.3ISN0   0   0.0     (SAC101.3b) case2   GDP IPU0  20116134145.99       46.31ISN0   0   0.0        (early version) In case1, what last  three digit reflects (ie 338.00). I wish to obtain HYPO file format as shown in case2. Please help me out ... t... [more]
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Geo .
2011-06-27 22:40:38 - 2011-07-08 05:11:33
Hi, Is there any possibility that SAC developers could add documentation on calling SAC within a Shell script to the SAC User guide? This is an area I repeatedly had problems with and haven't found a robust solution yet. The external documentation that I have found online haven't been that helpful either. Thank you. Januka.
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Arthur Snoke
2011-07-07 02:34:49
For all transfer commands, there is a line printed to the screen: Waveform multiplied by 1.000000 after deconvolution. So far as I can tell it, this line serves no purpose. If any of you know a reason to keep this printed output, please let me know.
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Andrew Schaeffer
2011-07-06 22:19:25
Hello, I am trying to resolve a difference between the SAC versions 101.3b and 101.4. *In 101.3b*: I am performing "rotate to gcp" on a north and east component seismogram, and writing out the radial and transverse components: r s1.dn s1.de rotate to gcp ->If I list the header (lh) at this point, the KCMPNM header value is now empty (ie doesn't show up). write s1.dr s1.dt quit If I start sac again, and read in the dr and dt components, they now have the KCMPNM header value, with "Q" for ... [more]
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