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 March 2009
Daniel Griscom
[Trying to send this a third time... Dan]
At 1:30 PM +0000 3/28/09, George Helffrich wrote:
>On 28 Mar 2009, at 12:28, Daniel Griscom wrote:
>>At 10:39 AM +0000 3/28/09, George Helffrich wrote:
>>> 1) Undefined character values in the binary file should be
>>>padded with blanks, not trailing zero characters, to their field
>>>lengths (8 or 16 characters, as appropriate);
>>
>>Are you sure? The SACA example I have uses trailing nulls (which
>>surprised me).
>
>Positive. The binary format is…
[more]
No replies
Mohamed Kamaleldin Abdel Galeil Salah
Dear SAC users
I am working on data from a list of seismic stations which have
different types of sensors: CMG-40, CMG-3T-120s, CMG-3ESP, STS-1, and
STS-2. I need to remove the instrument response from SAC files. I
could get information on Poles and Zeros data. However, I could not
find enough information about the normalizing factor and hence, how to
calculate the CONSTANT value.
If any one has information about the CONSTANT of these sensor types, I
will appreciate it!
Regards!
No replies
Dear Sirs/Madams,
I'm the author of a free IRIS-supported Macintosh program called
SeisMac, which uses Mac laptops' built in accelerometers to convert
the laptops into (not very accurate) seismographs. You can find more
about it at <http://www.suitable.com/tools/seismac.html>.
I'm finishing off an update which will let you export selected data
as a binary SAC or ascii SACA file. I think I've got it right (Global
Earthquake Explorer successfully reads the SAC files), but I'd love
to have…
[more]
Replies
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Re: SAC/SACA file format verification - Chad Trabant - 2009-03-28 04:36:24
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Re: SAC/SACA file format verification - Daniel Griscom - 2009-03-28 15:28:03
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Re: SAC/SACA file format verification - George Helffrich - 2009-03-28 20:30:33
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Re: SAC/SACA file format verification - George Helffrich - 2009-03-28 17:39:09
Mohammad Youssof Ahmed Soliman
Hi all,
Actually I tried many times to produce a polt for (BAZ vs Time )for the
Receiver functions that I got but I could not.
Could you help me to do that
I am not using sac2000(to use Prof. Herman Package) but I am using
sac(101.1)on linux 64bit machine.
Thanks a lot
with my best regards,
Mohammad Youssof
Mohammad Youssof
PhD Candidate
Geophysics Group
University of Copenhagen
Øster Voldgade 10
1350 København K
Location: 03.1.381
Phone: +45 353-22460
No replies
Amarjeet Jaiswal
Myself Amarjeet Kumar, a 3rd year student of the Department of Exploration
Geophysics at IIT Kharagpur, India.I am very new user of SAC
software, I have got one project based on SAC software.I requested for SAC
software on IRIS..And I installed it on my laptop. I have ubuntu installed
in my laptop.
Whenever I am trying to execute DATAGEN commands, I am getting this
message:-
ERROR 131: sac/datagen directory not found. contact llnl for this
data(peterg@llnl.gov
<https://webmail.iitkgp.ac.in/…
[more]
Replies
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Re: Datagen is not working - Brian Savage - 2009-03-16 16:03:09
mary
Dear Sir
I have three questions about macros in the SAC:
(1)In the example, particle motion plots are produced for five different two second time windows on the same data file: READ ABC
SETBB TIME1 0
DO TIME2 FROM 2 TO 10 BY 2
XLIM %TIME1 $TIME2
TITLE 'Particle Motion from %TIME1 to $TIME2$'
PLOTPM
SETBB TIME1 $TIME2
ENDDO
(Why is a dollar sign needed after TIME2 in the TITLE command?)
(2)In the example, we need to calculate the tangent of an angle that has already been stored in the b…
[more]
No replies
Charlotte Rowe
Hi, I'm new to the SAC help list so maybe this has been addressed
elsewhere. I have obtained the latest Linux version and have carefully
gone through all the setup instructions on my machine. Unfortunately I
don't have administrative access to my own (institutional-owned) laptop so
have had to put the SAC files into alternate directories and adjust the
paths and environmental variables accordingly.
When I invoke sac, all I get is a Floating Point Exception.
I have put this same version of SA…
[more]
No replies
Zhouchuan Huang
Hello,
I have problem using "merge".
I would like to read file names from another file and make it as variables.
But it seems that the "merge" command needs a full name.
e.g. I can read a file this way:* r 1997.123.*.sac*, it works well.
but when I use merge: *merge 1997.123*.sac*, it returns the error: *Error
108: file does not exist*.
So could you help me? Thank you very much!
--
Zhouchuan Huang
School of Earth Sciences and Engineering
Nanjing University
22 Hankou Road
Nanjing 21009…
[more]
Replies
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Re: help-"merge" - George Helffrich - 2009-03-09 19:55:41
Alejandro Gallego
Hi could you please tell me what means this error and how can I fix it.
ERROR 0: Resulting error from shift exceeded tolerance (1e-6): 0.00025
Please report bug to: sac-help@iris.washington.edu
this occur when I am usgin plotpk, picking phases
Thanks
Alejandro
No replies
Grant Mott
I am trying to find a time history of displacements. Typically, I have
found that sac files are acceleration time histories. It appears (based on
the header - dependent variable) that there may be displacement data
available. Does anyone know of any time vs. displacement data? Is there a
quick way to narrow my data search to only displacement data?
Thanks!
Grant
