Thread: need to cut sac data in 30 to 90 degree teleseismic range

Started: 2019-11-19 15:07:47
Last activity: 2019-11-19 23:37:14
Topics: SAC Help
Bijayananda Dalai
2019-11-19 15:07:47
Good evening sir.I am Bijayananda Dalai from India,currently works as ph.d
research scholar at CSIR-National Geophysical research institute,Hyderabad
.I have a very small query regarding sac data
manipulations(cutting).However, my raw data sets are of sac format that
consists of day file(one raw sac file/day/station) and i donot know more
about sac files in which portion of the waveform the earthquake is
recorded. i just want to apply receiver functions on my raw data sets.For
this, data needs to be in teleseismic range(30-90 degree) with event
magnitude > 4/5 and cutting of the waveforms some seconds before p onset
and some seconds after p-onset and so on....can you please suggest how to
make my raw sac file data to that mentioned form(by using something like
ndksearch).Thank you.


Kind Regards,
Bijayananda Dalai
PhD Research Scholar
AcSIR,CSIR-NGRI,Hyderabad,India

  • Hi,

    You can to use the sac command apk (automatic event picking), to extract the events of your data.
    but, apk must will adjust to your needs prior you applied it.

    Then use cut command to extract windows of data

    You can read the help for apk command.

    In SAC,
    sac> help apk

    HTH,

    Milton

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

    Centro di Ricerche Sismologiche (CRS)
    OGS - Istituto Nazionale di Oceanografia e di Geofisica Sperimentale

    Borgo Grotta Gigante 42/C
    (34010) Sgonico - Trieste - Italia
    Tel: +39 040 2140 156 (Udine)
    Tel: +39 040 2140 256 (Trieste)
    Cel.: +39 331 6481 935

    E-mail: mplasencia<at>inogs.it

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

    On 19 Nov 2019, at 18:16, Bijayananda Dalai <bijayanandadalai<at>gmail.com> wrote:


    Good evening sir.I am Bijayananda Dalai from India,currently works as ph.d research scholar at CSIR-National Geophysical research institute,Hyderabad .I have a very small query regarding sac data manipulations(cutting).However, my raw data sets are of sac format that consists of day file(one raw sac file/day/station) and i donot know more about sac files in which portion of the waveform the earthquake is recorded. i just want to apply receiver functions on my raw data sets.For this, data needs to be in teleseismic range(30-90 degree) with event magnitude > 4/5 and cutting of the waveforms some seconds before p onset and some seconds after p-onset and so on....can you please suggest how to make my raw sac file data to that mentioned form(by using something like ndksearch).Thank you.


    Kind Regards,
    Bijayananda Dalai
    PhD Research Scholar
    AcSIR,CSIR-NGRI,Hyderabad,India


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    • Thank you for the information. However is there any automatic script to
      doing this?

      On Tue, Nov 19, 2019, 23:35 Milton Percy Plasencia Linares <
      mplasencia<at>inogs.it> wrote:

      Hi,

      You can to use the sac command apk (automatic event picking), to extract
      the events of your data.
      but, apk must will adjust to your needs prior you applied it.

      Then use cut command to extract windows of data

      You can read the help for apk command.

      In SAC,
      sac> help apk

      HTH,

      Milton

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

      Centro di Ricerche Sismologiche (CRS)
      OGS - Istituto Nazionale di Oceanografia e di Geofisica Sperimentale

      Borgo Grotta Gigante 42/C
      (34010) Sgonico - Trieste - Italia
      Tel: +39 040 2140 156 (Udine)
      Tel: +39 040 2140 256 (Trieste)
      Cel.: +39 331 6481 935

      E-mail: mplasencia<at>inogs.it

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

      On 19 Nov 2019, at 18:16, Bijayananda Dalai <bijayanandadalai<at>gmail.com>
      wrote:


      Good evening sir.I am Bijayananda Dalai from India,currently works as
      ph.d research scholar at CSIR-National Geophysical research
      institute,Hyderabad .I have a very small query regarding sac data
      manipulations(cutting).However, my raw data sets are of sac format that
      consists of day file(one raw sac file/day/station) and i donot know more
      about sac files in which portion of the waveform the earthquake is
      recorded. i just want to apply receiver functions on my raw data sets.For
      this, data needs to be in teleseismic range(30-90 degree) with event
      magnitude > 4/5 and cutting of the waveforms some seconds before p onset
      and some seconds after p-onset and so on....can you please suggest how to
      make my raw sac file data to that mentioned form(by using something like
      ndksearch).Thank you.


      Kind Regards,
      Bijayananda Dalai
      PhD Research Scholar
      AcSIR,CSIR-NGRI,Hyderabad,India


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