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 April 2010
Onur Tan
Hello,
How can I convert SAC file to SEG2 format ?
best regards
Onur
for Brian:
The manual of the “write” command on the web and its help file in SAC are different. There is no information about SEGY format in the web page. However their revision date are the same.
Dr. Onur TAN
---------------------------------------------- 40.7866N 29.4500E ---------
TÜBİTAK Marmara Araştırma Merkezi, Yer ve Deniz Bilimleri Enstitüsü
TUBITAK Marmara Research Center, Earth and Marine Sciences Inst…
[more]
Replies
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Re: SAC to SEG2 - Xiaoting Lou - 2010-05-06 19:11:28
Mac Green
How exactly do I implement the CUT command in SAC for a case like this:
I have a file called data.sac
The number of points=N
I want only the first M points of the file.
It is the option given in the help files that Uses B and N, but I can not
implement it.
Thanks in advance.
Replies
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Re: "Cut" command in SAC - Konstantia Makra - 2010-04-19 17:10:11
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Re: "Cut" command in SAC - Konstantia Makra - 2010-04-19 17:12:14
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Milton Plasencia
Hi,
I follow the commands of Artur Snoke and i obtain:
SEISMIC ANALYSIS CODE [08/25/2009 (Version 101.3b)]
Copyright 1995 Regents of the University of California
SAC> fg seis
SAC> unwrap
remove this function: src/co/zmemad()
The same results occur in Linux box and MacOSX, 64 bits
sac binary version 101.3b.
Any suggestions?
Milton
**********************************
Milton P. PLASENCIA LINARES
Dipartimento Centro di Ricerche Sismologiche
Istituto Nazionale di Oceanografia e di Geofisi…
[more]
Replies
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Re: About definition of Fourier transform - Arthur Snoke - 2010-04-15 23:41:33
u
Hi, all,
does anyone know the zero-polar points for Guralp CMG-3ESPC?
Thx.
Lee
2010-04-15
Replies
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Re: Who has the zero-polar file for Guralp CMG-3ESPC? - Sheila Peacock - 2010-04-15 18:57:25
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Re: Who has the zero-polar file for Guralp CMG-3ESPC? - Onur Tan - 2010-04-15 21:10:50
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Re: Who has the zero-polar file for Guralp CMG-3ESPC? - Sheila Peacock - 2010-04-15 23:33:19
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Re: Who has the zero-polar file for Guralp CMG-3ESPC? - Despina Kementzetzidou - 2010-04-15 21:43:35
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dealing with big-endian and little-endian data with SAC and sacswap - Derek Schutt - 2010-10-12 23:38:33
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Re: dealing with big-endian and little-endian data with SAC and sacswap - Brian Savage - 2010-10-13 17:18:26
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Re: dealing with big-endian and little-endian data with SAC and sacswap - Derek Schutt - 2010-10-13 16:12:03
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Re: dealing with big-endian and little-endian data with SAC and sacswap - Marcelo Bianchi - 2010-10-13 23:06:00
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Arthur Snoke
If you have kept the SAC tree (or a binary tarball) for an older version
of SAC that you may want to run, the following script may be useful:
cat /usr/local/jas/bin/newsac
#!/bin/tcsh
setenv SACHOME "$1"
setenv SACAUX "${SACHOME}/aux"
setenv PATH "${SACHOME}/bin:${PATH}"
${SACHOME}/bin/sac /usr/local/jas/macros/init.m
To test if the unwrap command worked in 101.2, I did the following:
newsac /usr/local/jas/sac_archive/sac-080904
SEISMIC ANALYSIS CODE [09/04/2008 (Version 101.2)]
Copyrig…
[more]
No replies
Gian
Hi All..
can someone help me with this problem?
I can not execute the sac program..
I'm using centos 5 desktop 32 bit..
here's what I get :
[ctuser@localhost ~]$ echo $SACHOME
/home/ctuser/sac
[ctuser@localhost ~]$ echo $SACAUX
/home/ctuser/sac/aux
[ctuser@localhost ~]$ echo $PATH
/usr/kerberos/bin:/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/home/ctuser/bin:/home/ctuser/sac/bin
[ctuser@localhost bin]$ ./sac
/csspickpref . readcss will not read picks.
ERROR: Number 901 in INITCOMLISTS.
/…
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Re: ERROR: Number 901 in INITCOMLISTS - Brian Savage - 2010-04-14 17:38:59
Katie Boyle
Has anyone been able to successfully compile the SAC source code on a 64-bit
system? I've got both versions of libncurses, and my X11 libraries are
present. It seems like the problem is with linking. I'm stuck!
When I use gcc -m32, I get:
dfr.c:(.text+0x81c): undefined reference to `cmplxdiv'
dfr.c:(.text+0x888): undefined reference to `cmplxcj'
dfr.c:(.text+0x8a5): undefined reference to `cmplxmul'
dfr.c:(.text+0x8af): undefined reference to `cmplxtof'
dfr.c:(.text+0x905): undefined referenc…
[more]
No replies
Genti Toyokuni
Hello,
I want to ask you definition of Fourier transform used in the fft command.
Does the command perform the FFT with \exp(-i\omega t), or \exp(+i\omega t)?
I tried to find it out from the SAC manual, but I could not.
Regards,
Genti Toyokuni
Replies
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Re: About definition of Fourier transform - Arthur Snoke - 2010-04-12 16:18:31
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Re: About definition of Fourier transform - Arthur Snoke - 2010-04-13 03:09:51
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santanu
(no body)
No replies
If you have no interested in the sac > sss> traveltime command or in being
able to add phase-arrival times to SAC files, you can stop reading now.
Although TRAVELTIME is part of the SSS SAC Subprocess, it should be able to
work on a single data file. I have not succeeded in getting SYNTAX 1 and
SYNTAX 3 to work. (I am referring to terms used in the SAC> help
traveltime command.) Unless one of you can point out errors in my tests
below and/or easy fixes, nothing will be done in the soon…
[more]
No replies
Shahar Shani Kadmiel
Hi,
I am using MacSac 10.6f-grh104 and trying to compute a power spectra
from 10 seconds synthetic seismograms.
Is there a simple way of doing that in sac or do I have to take the
fft and multiply it by it's conjugate?
I can't get the PDS (in the SPE sub-process) command to work properly.
I might be using bad widow length. Is there a rule of thumb as to what
the length should be?
Thanks
No replies
lauretta
Hi, I need to use matlab within sac but I've some problems.
lauretta@lauretta-laptop:/media/ACERDATA/software/sac101.2-linux86$ ./bin/sacinit.shlauretta@lauretta-laptop:/media/ACERDATA/software/sac101.2-linux86$ export SACHOME=/media/ACERDATA/software/sac101.2-linux86lauretta@lauretta-laptop:/media/ACERDATA/software/sac101.2-linux86$ export PATH=${PATH}:${SACHOME}/binlauretta@lauretta-laptop:/media/ACERDATA/software/sac101.2-linux86$ export SACAUX=${SACHOME}/auxlauretta@lauretta-laptop:/m…
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Re: matlab - Brian Savage - 2010-04-01 17:28:02
