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 2011
George Sand França
Dear sierra
For update Azimuth and distance (DIST and GCARC) you need to change evdp, too!
cheers
Prof. George Sand L. A. de França
Observatório Sismológico
Universidade de Brasília
SG 13 Campus Universitário Darcy Ribeiro
70910-900
55 61 33404055
55 61 93033829 (pessoal)
www.obsis.unb.br
www.tremordeterra.blogspot.com
"Never be afraid to try something new. Remember, amateurs built the ark, professionals built the Titanic. "
sac-help-request@iris.washington.edu escreveu:
> Sen…
[more]
No replies
Shahar Barak
> Dear sir/madam,
>
> I am trying to sort traces by distance.
> I found a "sort" command in the user guide which seems to allow to sort
> files according to a header field:
> http://www.iris.edu/software/sac/commands/sort.html
>
> However, when I use it I get: "ERROR 1106: Not a valid SAC command"
>
> Thanks,
>
> Shahar Barak
>
> --
> Shahar Barak
> =======================================
> *Department of Geophysics, Stanford University*
> Mitchell Building , 397 Panama Mall, Stanford CA 94305-…
[more]
No replies
Fatih Sevim
Hi,
I have a pole zero files to avoid instrument response from signal and I use the command like " transfer from polezero subtype pz_file ". Is this the true way to obtain signal which doesn't include instrument response.
Or I must add " to vel " end of the command line ?
Best regards,
Fatih.
No replies
Sheila Peacock
To remove the instrument response completely you need "to none" at the end of the
"transfer" command. You might need to use "freqlimits" in your "transfer" command
to limit the low-frequency part of the signal; and I have always found it necessary
to run "rmean", "rtrend" and "taper" on a seismogram before attempting to remove
the instrument response.
Sheila Peacock
Blacknest.
-------- Original Message --------
Subject: [SAC-HELP] transfer command
Date: Mon, 24 Jan 2011 16:52:24 +0200
Fro…
[more]
No replies
Sierra Boyd
Hello,
I have a question about the number of poles for a Butterworth filter
when there are 2 passes.
When n, the number of poles, is not specified, is the default value of
2 used? Does this mean there are 4 poles with 2 passes when n is not
specified?
Suppose n = 4 and p = 2. Are there 8 poles?
Best regards,
--Sierra
No replies
Abhey Ram Bansal
Recently I was installing SAC on my laptop running on UBUNTU but when I
modified my ~/.bashrc file adding following two lines
export SACHOME=/usr/local/sac
source ${SACHOME}/bin/sacinit.csh
and after saving the file. I run following command
source ~/.bashrc
the following error message come.
No command 'setenv' found, did you mean:
Command 'netenv' from package 'netenv' (universe)
Could any one please help me sorting out the problem.
Thanking you
Abhey
Replies
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Re: installing SAC on UBUNTU - Onur Tan - 2011-01-13 18:00:04
-
Re: installing SAC on UBUNTU - Onur Tan - 2011-01-13 18:02:30
Hello,
I would like to know how to get the distance and azimuth of a station
with respect to the hypocentral info, evla and evlo.
I read in a sac file that came from IRIS. I then change the values of
evla and evlo. I then listhdr inclusive to look at all the header
values. The distance and azimuth are not updated.
However I can get the distance and azimuth of a station with respect
to an event when I download miniSEED data from another source and
convert it to SAC format. I then change the v…
[more]
No replies
Alireza Alinaghi
Hi
I have been trying to use depmec in sac but after i saw matlab logo flashing
by, I got the following error message in sac command window:
*Allocating and filling Matlab workspace arrays... *
*Copying to Matlab workspace ... *
*Done.*
*>> ??? Undefined function or variable 'sacdepmec'.*
*
*
Could you please tell me what is the source of the problem and how i can fix
it?
I am using sac version 101.0 and matlab (7)R14 on Fedora 10 linux machine.
Thank you in advance,
Alireza
No replies
Tim MacDonald
I am having a problem getting cutim to work on the 101.4 release for Linux. I got a segmentation fault error when using cutim as follows:
SAC> read *
2002.110.10.49.30.0000.CN.BBB..BHE.D.SAC 2002.110.10.49.30.0000.CN.BBB..BHN.D.SAC 2002.110.10.49.30.0000.CN.BBB..BHZ.D.SAC 2002.110.10.49.30.0000.CN.BIB..EHZ.D.SAC
SAC> cutim 100 200
Segmentation fault
I tracked the segmentation fault error to the gcCollect routine in gcCollect.c and made the following changes to the code:
/*
struct CSStree *…
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No replies
Tsitsi Madziwa-Nussinov
2010-12-23 23:28:25
- 2011-01-05 18:56:02
(no body)
Replies
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Re: The results of your email commands - Alessandro Pino - 2011-01-05 18:56:02
I had a go some time ago to understand the meaning of RESP files and
wrote some notes, which follow. Please note that they might not
be correct, or might be incorrect for data from other stations or
instruments. I was trying to establish the relationship between
the parameters in RESP files and the parameters in headers of
IMS (GSE)-format data from the CTBTO International Data Centre.
Sheila Peacock
Blacknest.
Meaning of numbers in rdseed RESP files
Here is a sample rdseed RESP file, whic…
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No replies
u
2011-01-05 10:45:56
Hi, all,
I want to know the meanings of each lines in the RESP.* files generated by RDSEED. Where can I find an instruction?
Regards,
Lee
Replies
-
Re: where can i find the instruction for response file extracted from seed files by rdseed? - Chad Trabant - 2011-01-04 19:43:00
-
Re: where can i find the instruction for response file extracted from seed files by rdseed? - Arthur Snoke - 2011-01-04 23:05:31
maria manakou
(no body)
Replies
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Re: problem with interpolation - Arthur Snoke - 2011-01-04 23:00:50
Hi, all,
Happy new year !!!
I have a question about the amplitude ratios between two seismograms before and after removing the instrumental response.
Assuming that zeros and poles of these two components (S1 and S2) are coincident, their normalization factors (A1 and A2) are different, and two seismograms after deconvolution of instrumental response are represented as S1_r and S2_r. So, do we have S1_r/S2_r = S1/S2 * A2/A1???
Regards,
Lee
