Thread: Units for Time series file and IDEP=UNKNOWN

Started: 2014-04-07 21:48:15
Last activity: 2014-04-09 16:06:13
Topics: SAC Help
Mike Padgett
Units for Time series file and IDEP=UNKNOWN
2014-04-07 21:48:15
The SAC manual lacks details when some of the seed files are a little
ambiguous.



For instance:



For IU, QSPA, Location=20, VHZ seed file:



SAC> read 2008.175.21.57.57.6228.IU.QSPA.20.VHZ.M.SAC

SAC> LH lists:



IFTYPE = TIME SERIES FILE

IDEP = UNKNOWN

DEPMIN = -1.089e+08

DEPMAX= 1.967e+08



What are these units?

If these units are displacement in nano-Meters, then has an instrument
response been applied or must one be applied with something like "transfer
evalresp to none .."



Any help would be most appreciated,

Mike Padgett


  • Milton Plasencia
    Re: Units for Time series file and IDEP=UNKNOWN
    2014-04-08 12:55:23
    Hi Mike,

    i assume you have used rdseed to convert seed volume to sac format,
    and also have used some one of Q data type variable

    Q = specify data type (E=Everything, D=Data of undetermined state, M=Merged Data, R=Raw waveform data, Q=QC'd data);

    so, you see the M=Merged data, M is present in you file name.

    Try rdseed with only Q=QC'd data and you obtain data with quality control.

    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 141 (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 Apr 7, 2014, at 9:48 PM, Mike Padgett <mpadgett<at>quantum-earth.com> wrote:

    The SAC manual lacks details when some of the seed files are a little ambiguous.

    For instance:

    For IU, QSPA, Location=20, VHZ seed file:

    SAC> read 2008.175.21.57.57.6228.IU.QSPA.20.VHZ.M.SAC
    SAC> LH lists:

    IFTYPE = TIME SERIES FILE
    IDEP = UNKNOWN
    DEPMIN = -1.089e+08
    DEPMAX= 1.967e+08

    What are these units?
    If these units are displacement in nano-Meters, then has an instrument response been applied or must one be applied with something like “transfer evalresp to none ….”

    Any help would be most appreciated,
    Mike Padgett
    _______________________________________________
    sac-help mailing list
    sac-help<at>iris.washington.edu
    http://www.iris.washington.edu/mailman/listinfo/sac-help


    • Mike Padgett
      Re: Units for Time series file and IDEP=UNKNOWN
      2014-04-08 14:47:08
      Many thanks, I will try the Q option.

      I can merge once all if the files are definitely in the same units with instrument response removed.

      Mike Padgett

      On Apr 7, 2014, at 10:55 PM, Milton Plasencia <mpplasencia<at>gmail.com> wrote:

      Hi Mike,

      i assume you have used rdseed to convert seed volume to sac format,
      and also have used some one of Q data type variable

      Q = specify data type (E=Everything, D=Data of undetermined state, M=Merged Data, R=Raw waveform data, Q=QC'd data);

      so, you see the M=Merged data, M is present in you file name.

      Try rdseed with only Q=QC'd data and you obtain data with quality control.

      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 141 (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 Apr 7, 2014, at 9:48 PM, Mike Padgett <mpadgett<at>quantum-earth.com> wrote:

      The SAC manual lacks details when some of the seed files are a little ambiguous.

      For instance:

      For IU, QSPA, Location=20, VHZ seed file:

      SAC> read 2008.175.21.57.57.6228.IU.QSPA.20.VHZ.M.SAC
      SAC> LH lists:

      IFTYPE = TIME SERIES FILE
      IDEP = UNKNOWN
      DEPMIN = -1.089e+08
      DEPMAX= 1.967e+08

      What are these units?
      If these units are displacement in nano-Meters, then has an instrument response been applied or must one be applied with something like “transfer evalresp to none ….”

      Any help would be most appreciated,
      Mike Padgett
      _______________________________________________
      sac-help mailing list
      sac-help<at>iris.washington.edu
      http://www.iris.washington.edu/mailman/listinfo/sac-help


    • Mike Padgett
      By network time series file and IDEP=UNKNOWN
      2014-04-09 16:06:13
      Seed files downloaded using Breq-Fast using a quality=Best for networks CI, II and IU all produce (for me) SAC files with quality= M, "Time Series," IDEP= UNKNOWN.

      Using rdseed with -Q Q, found nothing in a set of files from CI, IU and II.

      I went back to Breq-Fast and tried to get new seed files with Quality= Q. The II network had "Q" files, but neither CI nor IU could find any waveform data with "Q" for quality. Both CI and IU had "B" data.

      Are there network administrators who can certify the contents of the "B" seed data for CI, II and IU?

      Mike Padgett

      On Apr 7, 2014, at 10:55 PM, Milton Plasencia <mpplasencia<at>gmail.com> wrote:

      Hi Mike,

      i assume you have used rdseed to convert seed volume to sac format,
      and also have used some one of Q data type variable

      Q = specify data type (E=Everything, D=Data of undetermined state, M=Merged Data, R=Raw waveform data, Q=QC'd data);

      so, you see the M=Merged data, M is present in you file name.

      Try rdseed with only Q=QC'd data and you obtain data with quality control.

      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 141 (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 Apr 7, 2014, at 9:48 PM, Mike Padgett <mpadgett<at>quantum-earth.com> wrote:

      The SAC manual lacks details when some of the seed files are a little ambiguous.

      For instance:

      For IU, QSPA, Location=20, VHZ seed file:

      SAC> read 2008.175.21.57.57.6228.IU.QSPA.20.VHZ.M.SAC
      SAC> LH lists:

      IFTYPE = TIME SERIES FILE
      IDEP = UNKNOWN
      DEPMIN = -1.089e+08
      DEPMAX= 1.967e+08

      What are these units?
      If these units are displacement in nano-Meters, then has an instrument response been applied or must one be applied with something like “transfer evalresp to none ….”

      Any help would be most appreciated,
      Mike Padgett
      _______________________________________________
      sac-help mailing list
      sac-help<at>iris.washington.edu
      http://www.iris.washington.edu/mailman/listinfo/sac-help


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