Ayele
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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-
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-----
_______________________________________________
sac-help mailing list
sac-help<at>iris.washington.edu
http://www.iris.washington.edu/mailman/listinfo/sac-help
sac-help mailing list
sac-help<at>iris.washington.edu
http://www.iris.washington.edu/mailman/listinfo/sac-help
Onur Tan
