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 September 2010

Marcelo Bianchi
2010-09-28 18:12:49 - 2010-09-29 21:55:36
Dear All, Today I was using the transfer command to remove the instrument from resp files and found something strange. The transfer evalresp couldn´t find the RESP file because of a time calculation error. My file started at 01:45:05.280 and the resp file, here is the output from SAC and the header from the RESP file: SAC> lh kzdate kztime FILE: 2008.330. - 1 ----------------------------------------------- kzdate = NOV 25 (330), 2008 kztime = … [more]
Philip Crotwell
2010-09-28 23:27:59 - 2010-09-29 00:57:03
Hi I have a java based seismic file reading package called seisFile that handles SAC files amongst others ( As part of that I have all the "enumerated header field values" as constants (ie static final fields). At the time I created this, they were all unique. I was looking at the sac docs today and noticed that there have been new values added (51-86). I was going to add them, but they are no longer unique. For example there are 2 IO "enumerated headers"… [more]
Panxu Zhang
2010-09-25 03:36:46 - 2010-09-25 15:06:26
Hi all, I download some earthquakes from IRIS. I set time range as 100 before first P and 600 after first P. But the begin time(B in SAC header) in SAC file is zero. How could I get the correct time? (assume the time when earthquake happened is zero, then B should be a number like 600 or something) I think of a method that, first calculate the first P time as T1MARKER with TAUP, then change header B as (T1-100). But SAC cannot recognize the command---"ch b (t1-100)". How could I get it run? … [more]
Samir L.
2010-09-24 18:02:20 - 2010-09-24 19:51:03
Dear all, I work currently with a python script which invokes SAC to process some data. Since my database usually involves mseed files, I used "ms2sac" to convert them to sac files. However, I found out that during the processing steps Polezero files are also needed. Could someone tell me what are these files and how I can get them? Thank you in advance, Cheers, Wik.
srichand prajapati
2010-09-24 06:45:31
Sir,   I try to installed the SAC on Cygwin (Cygwin based SAC) but i am not able to installed it. I already registered on IRIS site to get SAC software. when i run ./configure, its work well but i try to compile by using  make it show some error in src directory. please help to installed SAC on Cygwin plateform. regards srichand --- On Thu, 23/9/10, <> wrote: From: <sac-help-request@… [more]
Geo .
2010-09-13 19:07:04 - 2010-09-14 17:54:46
Greetings, Could someone please clarify the physical meaning of freqlimits when using TRANSFER function in SAC? I have read the documentation but for me it still is a little fuzzy. Does it mean that when we use certain freqlimits, for example freqlimits 0.01 0.015 100 200, the result we see is a narrow band passed record with corner frequencies of, in this example 0.15Hz and 100Hz? If that were the case and if I wanted to have the broadest bandpass possible, what would be the limits to use? Whe… [more]
2010-09-10 12:28:01 - 2010-09-10 15:01:33
please, I am new in this forum. But i am a user of SAC for some time now. I seek to know if i could have some software to convert data in sac format (output from SAC) into SEED and AH format. Also, I wish to know if there are softwares which can accept data in sac format as input to produce group velocity maps and inversed structures. hope you help me out. Ndikum. --------------------------------------------------- NDIKUM ERIC NDOH, C/O C.M.F.I. YAOUNDE, P.O. Box 6090, CAMEROON, WEST AFRICA … [more]
Zhouchuan Huang
2010-09-06 22:52:19
*Dear everyone, * ** *When plotting using sac, some information such as the network (KNETWK), station (KSTNM), channels (KCMPNM) and time (KZDATE, KZTIME) will be plotted together with each seismogram. * *I wonder if I can add more information, such as distance (DIST) on each seismogram simultaneously.* ** *Thank you very much.* ** *Best wishes,* ** *Zhouchuan* -- Zhouchuan Huang School of Earth Sciences and Engineering Nanjing University 22 Hankou Road Nanjing 210093 P.R.CHINA. Tel: +8613675… [more]
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