[SAC-HELP] YNT: Calculating the CONSTANT to use to remove instument response

[Onur Tan]

Hi,

SAC PZ constant must be recalculated from the A0 value of seismometer.
SAC PZ file is in radyan, not Hz as in Guralp calib. documents.

you can also look this message:
http://www.iris.washington.edu/pipermail/sac-help/2009-February/000492.html


best regards,
Dr. Onur TAN
----------------------------------------------   40.7866N 29.4500E ---------
 TÜBİTAK Marmara Araştırma Merkezi,  Yer ve Deniz Bilimleri Enstitüsü
 TUBITAK Marmara Research Center, Earth and Marine Sciences Institute
 Gebze - Kocaeli - TURKEY
________________________________________

Kimden: sac-help-bounces at iris.washington.edu [sac-help-bounces at iris.washington.edu], Atalay Ayele [atawon at yahoo.com] Adına
Tarih: 12 Nisan 2009 Pazar 11:49
Kime: sac-help at iris.washington.edu; Melaku Ayenew
Konu: Re: [SAC-HELP] Calculating the CONSTANT to use to remove instument        response

Selam Melaku,

If you got the zeroes and poles files from IRIS/PASSCAL, you should be able to get the constants as well.

once you removed responses from other instruments you can run:

Trans from none to wa

if you want to simulate WA instrument record.

Good luck,



Atalay

--- On Thu, 4/9/09, Melaku Ayenew <mayenew at gmail.com> wrote:

> From: Melaku Ayenew <mayenew at gmail.com>
> Subject: [SAC-HELP] Calculating the CONSTANT to use to remove instument response
> To: sac-help at iris.washington.edu
> Date: Thursday, April 9, 2009, 2:50 AM
> Hi All,
> I am trying to remove instrument responses from STS_2,
> CMG3T. CMG_ES broadband instruments. I got the poles and
> zeros from IRIS Pascal Instrumentation. But I have
> difficulty figuring out what constant I should use in the
> *.pz file that has to read by the SAC TRANSFER command. For
> example, I was trying to synthesis a WA seismogram by
> removing the STS_2 response and convoulating the WA
> response. I used a constant of 1 in this calcultion. The
> synthesis seismogrm looks good but the displacemnt values
> don't make sense (they are several hunderd meters). I
> understand it is because of the CONSTANT=1 I put. My
> Question is How can I calculate the correct CONSTANT that I
> need to put with the zeros and poles in the SAC *.pz file.
> The IRIS PASCAL instrumentation page gives the zeros and
> poles and a normalization factor.
>
> I greatly appreciate your help in this matter.
>
> Melaku Bogale
> New Mexico State University
> Department of Physics
> Las Cruces NM 88003-8001
>
>
> -----Inline Attachment Follows-----
>
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