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 February 2011

Yannik Behr
2011-02-24 22:40:12
Hi, I am removing the instrument response first using a pole-zero file (SAC format) and then a RESP file (both extracted from the same DatalessSEED volume). The resulting traces show a phase shift of around 0.5 s. Is there anything wrong with the way I'm correcting for the instrument response? I have attached the script that I used to test this. Best, Yannik -- Yannik Behr PhD Student in Seismology School of Geography, Environment, and Earth Sciences Victoria University of Wellington... [more]
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Hello, Several years ago, I tried making power-spectral-density plots for noise characteristics of temporary seismograph stations, but it's been many years since I did this, and I have forgotten the details. One of my colleagues just sent me a copy of my original macro to ask me about it, and I find myself second-guessing myself as to whether I did it right originally. Here's the relevant section of the macro and my query: cut 0 1000 r 2011.038.17.00.00.0000.CN.YUK1..HHZ.D.SAC cut off trans... [more]
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Warren Caldwell
2011-02-15 00:05:59 - 2011-02-17 18:35:47
Hi all, I believe I've found a bug (unbalanced fopen/fclose) in readsac.m. When I read in a large number of sac files in Matlab using F=readsac(* list-of-files-tens-**long*), Matlab hangs and crashes. I fixed it in sac-101.2/utils/readsac.m by adding an fclose statement as follows: Original (first line is line 243): if ~ismember(B(7), 1:6) % non-native byte order [comp, mxsize, endian] = computer; Changed: if ~ismember(B(7), 1:6) % non-native byte order *fclose(f... [more]
Replies
reza emami
2011-02-14 06:00:58
reza.emamy@gmail.com
No replies
Vladimir Karpinsky
2011-02-08 21:21:58
Hello, I am sorry to inform you, that I have trouble with reading CSS 3.0 files again. There are no errors while reading data, but data are reading incorrectly. Here: http://geo.phys.spbu.ru/~karp/sac_css/ I put 3 files with data and plots obtained by SAC and WSG. I see difference between data types in my wfdisc file and wfdisc file that create writecss: we use s4 (SUN IEEE integer), writecss create t4 (SUN IEEE single precision real). Help of readcss says that s4 is also supported by ... [more]
No replies
Aubreya Adams
2011-02-05 22:22:39 - 2011-02-06 02:42:48
Hello, I have recently upgrade from a PowerPC to an Intel Mac (10.6.6) and am trying to recompile some fortran codes that call upon sac i/o functions. When I try to compile the codes, I get following warning about the sac library and resulting errors: ld: warning: in /usr/bin/sac/lib/sacio.a, file was built for unsupported file format which is not the architecture being linked (i386) Undefined symbols: "_getfhv_", referenced from: _MAIN__ in cc7sScyY.o _MAIN__ in cc7sScyY.o ... [more]
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cleat zeiler
2011-02-03 04:57:07
I am petitioning the help of SAC users to understand pick error. The intial phase of the project is to compare unfiltered events picked by different users. While this is more a test of the users ability to pick seismograms, at a later time we will incorporate other software and determine if there is a bias in the methodologies of establishing picks made by different software, along with algorithms used to process the events with in a software package. We first need to establish a base line a... [more]
No replies
Milton Plasencia
2011-02-03 03:24:33
Thanks to all, I used year ago this command and did not remember to use, Ray pointed me in the correct direction. Cheers, M ********************************** Milton P. PLASENCIA LINARES Dipartimento Centro di Ricerche Sismologiche Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS Borgo Grotta Gigante 42/C (34010) Sgonico - TRIESTE - ITALIA Tel: +39-040-2140136 Fax: +39-040-327307 E-mail: mplasencia@ogs.trieste.it ASAIN (Antarctic Seismographic Argentinean Italian... [more]
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Milton Plasencia
2011-02-03 00:05:35
Hi, I try the spectrogram commands OK, i want save the plot in files postscript or another format, how i can accomplish this?. Regards, Milton ********************************** Milton P. PLASENCIA LINARES Dipartimento Centro di Ricerche Sismologiche Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS Borgo Grotta Gigante 42/C (34010) Sgonico - TRIESTE - ITALIA Tel: +39-040-2140136 Fax: +39-040-327307 E-mail: mplasencia@ogs.trieste.it ASAIN (Antarctic Seismographic Ar... [more]
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