Thread: unknown physical unit

Started: 2014-01-10 06:00:50
Last activity: 2014-01-10 06:00:50
Topics: SAC Help
firdaus
2014-01-10 06:00:50
dear all,

i've extracted sac file into text file which contains a time series of
particular earthquake. I'm going to import it to EERA in order to have
response spectra.
However, i'm little bit confused with physical unit of this time series
where it does not mention obviously in this text file.

I've tried to write a command as follow:

%saclst idep f II.COCO.00.BH1.M.2004.361.010030.SAC

the output is
"12345"

i have no idea to solve it.

Kindly advice


regards

  • Sheila Peacock
    2014-01-09 22:47:29
    Dear Firdaus,

    SAC does not specify or require the units of the data read in
    or written out. The units are digital samples, and the domain
    is velocity, acceleration, displacement, pressure, or whatever
    the sensor measures. If you carried out "transfer" in SAC
    then the domain might have changed, e.g. from velocity to
    displacement, but if you did not, then the domain is still
    that of the sensor. The manufacturer's data sheet for a
    good seismometer will tell you which domain it is in - look
    for the units in which the gain is specified e.g. V/(m/s)
    for a velocity seismometer or V/(m/s^2) for an accelerometer.

    Sheila Peacock,
    Blacknest.


    On 01/09/2014 02:00 PM, Firdaus firdaus wrote:
    dear all,

    i've extracted sac file into text file which contains a time series of particular earthquake. I'm going to import it to EERA in order to have response spectra.
    However, i'm little bit confused with physical unit of this time series where it does not mention obviously in this text file.

    I've tried to write a command as follow:

    %saclst idep f II.COCO.00.BH1.M.2004.361.010030.SAC

    the output is
    "12345"

    i have no idea to solve it.

    Kindly advice


    regards


    _______________________________________________
    sac-help mailing list
    sac-help<at>iris.washington.edu
    http://www.iris.washington.edu/mailman/listinfo/sac-help



  • Milton Plasencia
    2014-01-09 23:59:07
    Hi,

    The file II.COCO.00.BH1.M.2004.361.010030.SAC,

    said me

    II=Network IRIS-IDA
    Station= COCO
    Instrument= 00 (here see in http://www.iris.edu/mda/II/COCO/00/BH1 ) 00 correspond to Geotech KS-54000 Borehole Seismometer
    BH1= BroadBand - High Gain (Velocity) - Componente 1
    SAC format

    HTH,

    Milton P. Plasencia Linares
    mpplasencia<at>gmail.com



    On Jan 9, 2014, at 3:00 PM, Firdaus firdaus <alikomeini<at>gmail.com> wrote:

    dear all,

    i've extracted sac file into text file which contains a time series of particular earthquake. I'm going to import it to EERA in order to have response spectra.
    However, i'm little bit confused with physical unit of this time series where it does not mention obviously in this text file.

    I've tried to write a command as follow:

    %saclst idep f II.COCO.00.BH1.M.2004.361.010030.SAC

    the output is
    "12345"

    i have no idea to solve it.

    Kindly advice


    regards
    _______________________________________________
    sac-help mailing list
    sac-help<at>iris.washington.edu
    http://www.iris.washington.edu/mailman/listinfo/sac-help


21:49:13 v.ad6b513c