All sac user: <br><br>@Thank you for the explanation, Dr. Onur.<br>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 <a href="http://www.passcal.nmt.edu/content/instrumentation/sensors/sensor-comparison-chart">http://www.passcal.nmt.edu/content/instrumentation/sensors/sensor-comparison-chart</a>), I got the error message:<br>
ERROR interpreting command: trans from polezero s' to '<br>Unkown instrument type:<br><br>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?<br>
<br>Thanks,<br>J.<br><br><div class="gmail_quote">On Thu, Jun 9, 2011 at 10:42 AM, Onur Tan <span dir="ltr"><<a href="mailto:Onur.Tan@mam.gov.tr">Onur.Tan@mam.gov.tr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hello<br>
<div class="im"><br>
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?<br>
<br>
</div>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)<br>
<div class="im"><br>
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.<br>
<br>
</div> you need a PZ file of output instruments. you can say “from polezero to new-polezero”.<br>
<br>
best regards<br>
o.<br>
<br>
<br>
<br>
Dr. Onur TAN<br>
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