[SAC-HELP] ask: transfer function

[Milton P. Plasencia Linares]

Hi Jenni,
yes, there is different, evalresp use the Response file that
is the "complete" response of the system, instead the polezero
only include the poles and zeros of sensor and constant can
include the amplitude factor of the digitizer.

For debugging the transfer command you can start using the half of
command,
sac> trans from polezero s polezero_file to none

and after add the second part, i suspect of use the second part,
verify the path of the 1s.pz file,

HTH,

Milton




**********************************
Milton P. PLASENCIA LINARES

Dipartimento Centro di Ricerche Sismologiche
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS

Borgo Grotta Gigante 42/C
(34010) Sgonico - TRIESTE - ITALIA
Tel: +39-040-2140136
Fax: +39-040-327307

E-mail: mplasencia at ogs.trieste.it

ASAIN (Antarctic Seismographic Argentinean Italian Network)
*********************************


Quoting "jenni wang" <u2injesus at gmail.com>:

> @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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