[SAC-HELP] ask: transfer function

[jenni wang]

All sac user:

@Thank you for the explanation, Dr. Onur.
But I still have problem regarding my second question. I have my polezero
file, but when I did as you suggest: from polezero to *.pz (e.g.polezero
file obtained from
http://www.passcal.nmt.edu/content/instrumentation/sensors/sensor-comparison-chart),
I got the error message:
ERROR interpreting command: trans from polezero s'  to '
Unkown instrument type:

Could anyone please help me to point out the mistake I made and tell me the
right command to apply to get the convolution done?

Thanks,
J.

On Thu, Jun 9, 2011 at 10:42 AM, Onur Tan <Onur.Tan at mam.gov.tr> wrote:

> Hello
>
> 1. I have a seismogram waveform which is velocity record from velocity
> transducer. I have the response instrument read with rdseed and the RESP.*
> is the velocity response, but the pole zero is displacement response. My
> question: When I apply trans from polezero ..., using that polezero obtained
> from rdseed, do I get the velocity ground motion (m/s or nm/s, etc. ) or do
> I get displacement ground motion?
>
> your input velocity PZ file must have an additional ZERO for SAC. SAC
> integrates the data with that ZERO. if you say "to none" your output will be
> disp. (m) ; if you say "to vel" you will get velocity (m/s)
>
> 2. After the deconvolution with the transfer command, can I do the
> convolution to apply another instrument response of the instrument types
> that are not in the list in sac reference manual? If yes, how can I do it?
> If not, would anyone please tell me the source where I can get the frequency
> response and polezero of the instrument types in the sac manual since I am
> trying to compare  records that could be obtained from different instruments
> with different response.
>
>     you need a PZ file of output instruments. you can say  "from polezero
> to new-polezero".
>
> best regards
> o.
>
>
>
> 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
>
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