[SAC-HELP] ask: transfer function

[jenni wang]

@Thank you for the info, Arthur. Is there any difference by applying
polezero or evalresp?

I got error with this command:
trans from polezero s %pzfile to polezero s 1s.pz

Could anyone please help to find out the mistake I make?

Thanks,
J.


On Thu, Jun 9, 2011 at 12:44 PM, Arthur Snoke <snoke at vt.edu> wrote:

> for your first question, you might consider using the evalresp option in
> transfer.  Also, polezero files written using recent versions of rdseed have
> comment lines that give details about things like the input and output
> units.  (Do note that rdseed uses m and SAC header says nm. See the transfer
> help message for a discussion.)
>
> For your second question, it would help if you copied/pasted the command
> sequence into an e-mail message.
>
>
> On Thu, 9 Jun 2011, jenni wang wrote:
>
>  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 fromhttp://
>> www.passcal.nmt.edu/content/instrumentation/sensors/sensor-compariso
>>
>> n-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.
>>
>
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