[SAC-HELP] ask: transfer function

[Arthur Snoke]

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.