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Active Message Threads for November 2007
Arthur Snoke
I used the wrong address for the sac-help listserv.
---------- Forwarded message ----------
Date: Wed, 28 Nov 2007 22:49:36 -0500 (EST)
From: Arthur Snoke <snoke@vt.edu>
To: Tim Ahern <tim@iris.washington.edu>, Brian Savage <savage@uri.edu>,
Robert B. Herrmann <rbh@eas.slu.edu>
Cc: sac-help-request@iris.washington.edu
Subject: Re: [SAC-HELP] doubles in sac
Tim and others,
Bob touched on what I think is the biggest problem in modifying sac: the header
is fixed in length so one could not…
[more]
Replies
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Re: doubles in sac - Brian Savage - 2007-11-29 19:28:21
Tim Ahern
Greetings
We have a question for the SAC users group. Recently a need to
support double precision floating point for data in SEED format has
been identified.
While SEED itself can support this, the problem comes with possible
output formats the rdseed program should support. The most widely used
format is SAC format in our estimation.
Our question is, is it possible for SAC to support double precision
floating point values without loosing precision? Would it be
extremely difficul…
[more]
Replies
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Re: Double Precision - Peter Goldstein - 2007-11-29 04:02:44
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Re: Double Precision - George Helffrich - 2007-11-29 15:40:59
Robert Herrmann
sac-help-request@iris.washington.edu wrote:
Tim: I do not know if this response will get back to the mailing list -
so you get a copy
If the data stream should be modified to have doubles for the data, we
should also consider doubles for the SAC float header values - One
CANNOT pick time correctly at 23:59:59 for 200 Hz data sets (I know this
is extreme) is the continuous data stream starts at 00:00:00 - the
seven digit accuracy of floating point is exceeded
One would just need to red…
[more]
No replies
Alejandro Gallego
Hi everybody
I want to change the background color of my figures. I am using this command
COLOR RED INCREMENT OFF SKELETON WHITE BACKGROUND BLACK LIST STANDARD
All the features change the color except the Background, anybody knows how
to fix this problem.
Thanks
Alejandro
No replies
aniso
Dear all,
I agree with Apostolos Agalos. I also think the Constant should be derived from the
multiplication of the Sensitivity with A0.
I think the following method should be right when calculating the CONSTANT.
CONSTANT=A0×Sensor Sesivity × Digitiser Gain × 2*pi
here A0 is in rad/sec Unit,Digitiser Gain is V/ms.
Replies
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Re: 回复:sac-help Digest, Vol 29, Issue 1 - George Helffrich - 2007-11-14 19:42:01
asheehan@UCSD.Edu
I am running Sac v101.1 on a Mac PPC G4 with OSX v10.4.10.
Does anyone know if the sac command 'mat' works on Macintosh
computers (with Sac v101.1 Mac PPC OSX version), and if
so, could you send me an example of using it?
This is what I got when I tried to run it.
First I read in some seismograms, then
SAC> mat testmat1.mat SACdata SeisData
Mfile specified is: testmat1.mat
ERROR 8002: Cannot link to MATLAB shared object:
or if I try a more interactive approach
SAC> mat
ERROR 8002: Cann…
[more]
No replies
Mohamed elgabry
i agree with Fang lihua and I strongly recommend you to read the book
Of Poles and Zeros: Fundamentals of Digital Seismology
by F. Scherbaum
________________________________
From: sac-help-bounces@iris.washington.edu on behalf of FANG Lihua
Sent: Wed 11/14/2007 12:18 PM
To: sac-help@iris.washington.edu
Subject: [SAC-HELP] ??:sac-help Digest, Vol 29, Issue 1
Dear all,
I agree with Apostolos Agalos. I also think the Constant should be derived from the
multiplication of the Sensitivity w…
[more]
No replies
agalos
I am not completely sure that this is the solution for you
but it is common to set as Constant the result from the
multiplication of the Sensitivity with A0.
try it!!
No replies
Hi,
I use SAC to remove the instrument response,
SAC>transfer from polezoro subtype response.pz to none freqlimits 0.01 0.02 5.0 8.0
the following is the content of response.pz
*******************************
POLES 5
-0.03701+0.03701
-0.03701-0.03701
-1131.00.0000
-1005.00.0000
-502.70.0000
ZEROS 2
0.00000.0000
0.00000.0000
CONSTANT ????
*******************************
But I don't know how to calculate the constant.
I got the calibration sheet from Gurapl. The normalization f…
[more]
Replies
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Re: remove instrument response - George Helffrich - 2007-11-14 17:09:24
