Thread: Instrument Response

Started: 2017-04-18 17:46:59
Last activity: 2017-04-19 13:54:18
Topics: SAC Help
REHMAN .
Instrument Response
2017-04-18 17:46:59
Hi,
I have downloaded the waveform and Response poles and
zeros in SAC format from JWEED. I removed the instrument response using
command " transfer from polezero subtype ./resp.pz to vel freqlimits 0.001
0.002 10 20" in SAC. Initially in sac header I have IDEP= unknown and after
removing response it changed to IDEP= VELOCITY (NM/SEC).
I have instrument properties in resp.pz file INPUT UNIT :
M, OUTPUT UNIT: COUNTS, INSTGAIN : 1.500000e+03 (M/S),SENSITIVITY :
2.516610e+09 (M/S).
So after removing instrument response , Output Should be in M/S ie.,
IDEP=Velocity(M/S) because we have count, sensitivity Instgain in meters
and seconds. But after removing reponse I am getting DEP= VELOCITY (NM/SEC).
So help me to
understand it .





Regards,
Rehman,
Dept. of Geophysics
Andhra University.

  • Milton Plasencia
    Re: Instrument Response
    2017-04-19 13:54:18
    Hi Rehman,

    Please, give a look in this topic at:

    https://ds.iris.edu/message-center/thread/1190/#m-2144

    Cheers,

    Milton

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    On Apr 18, 2017, at 18:06, REHMAN . <rehman.geophy<at>gmail.com> wrote:

    Hi,
    I have downloaded the waveform and Response poles and zeros in SAC format from JWEED. I removed the instrument response using command " transfer from polezero subtype ./resp.pz to vel freqlimits 0.001 0.002 10 20" in SAC. Initially in sac header I have IDEP= unknown and after removing response it changed to IDEP= VELOCITY (NM/SEC).
    I have instrument properties in resp.pz file INPUT UNIT : M, OUTPUT UNIT: COUNTS, INSTGAIN : 1.500000e+03 (M/S),SENSITIVITY : 2.516610e+09 (M/S).
    So after removing instrument response , Output Should be in M/S ie., IDEP=Velocity(M/S) because we have count, sensitivity Instgain in meters and seconds. But after removing reponse I am getting DEP= VELOCITY (NM/SEC).
    So help me to understand it .





    Regards,
    Rehman,
    Dept. of Geophysics
    Andhra University.

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