Thread: RE: About transfer function in SAC

Started: 2008-03-28 03:34:59
Last activity: 2008-03-28 03:34:59
Topics: SAC Help
Onur Tan
2008-03-28 03:34:59
Dear Xu

SAC uses omega convention. so you must multiply every poles and zeros
with 2*pi*f ( in general, f=1Hz for Guralp seismometers). Do not use
the values in Guralp Cal-Doc.

Add one Zero for integration.
And you have to calculate Constant using sensor and digitizer gain
values.

You can use this document:
http://www.le.ac.uk/seis-uk/downloads/seisuk_data_manage.pdf

I edit more detailed document, but in Turkish. If you want to read
only numbers :) in this document I can send you.

best Regards

Dr. Onur TAN
TUBITAK Marmara Research Center
Turkey




-----Original Message-----
From: sac-help-bounces<at>iris.washington.edu
[sac-help-bounces<at>iris.washington.edu] On Behalf Of wwxu
Sent: Wednesday, March 26, 2008 12:02 PM
To: sac-help<at>iris.washington.edu
Subject: [SAC-HELP] About transfer function in SAC

Dear ALL,

I am using function "transfer" to deconvolve the instrument response in
SAC, the usage is as "transfer from polezero subtype cmg3esp.response to
none", and the file "cmg3esp.response" is in the format as SAC mannual
told(poles, zeros, constant), here I want to know what is the unit of
poles and zeros, radian/sec or Hz? it is very different as we know, can
anyone help me?

Your sincerely,
Xu W.

************************************************
Dr. WeiWei Xu
Institute of Geology and Geophysics
Chinese Academy of Sciences
P.O.Box 9825
Beijing 100029
China
Tel: 0086-10-62007354(Office)
Fax: 0086-10-62010846
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