Thread: OMARKER Problem

Started: 2016-10-18 14:07:44
Last activity: 2016-10-19 01:52:41
Topics: SAC Help
Sachin Tiwari
2016-10-18 14:07:44
Dear Sac_help users,

I have some sac data from HYB station located on Indian Shield at Hyderabad. OMARKER doesn't seem to be set at correct value. I requested seed data file and extracted sac data using rdseed using summary file to put the event information in the sac headers.

I am not sure what could be the problem. Any suggestion regarding this?

NPTS = 87180
B = 3.000000e-04
E = 4.358951e+03
IFTYPE = TIME SERIES FILE
LEVEN = TRUE
DELTA = 5.000000e-02
IDEP = UNKNOWN
DEPMIN = -8.237908e+02
DEPMAX = 9.231357e+02
DEPMEN = -6.515828e-01
OMARKER = 67963
KZDATE = JAN 08 (008), 2000
KZTIME = 01:27:17.044
KSTNM = HYB
CMPAZ = 9.000000e+01
CMPINC = 9.000000e+01
STLA = 1.741700e+01
STLO = 7.855300e+01
STEL = 5.100000e+02
STDP = 0.000000e+00
EVLA = -1.048570e+01
EVLO = 1.121649e+02
EVDP = 2.000000e+00
KHOLE =
DIST = 4.815776e+03
AZ = 3.095449e+02
BAZ = 1.274029e+02
GCARC = 4.326407e+01
LOVROK = TRUE
NVHDR = 6
NORID = 0
NEVID = 0
LPSPOL = FALSE
LCALDA = TRUE
KCMPNM = BHE
KNETWK = G
MAG = 5.300000e+00

Any help will really be appreciated.

Thanks and regards,

Sachin Tiwari
IIT (ISM),Dhanbad
  • Wen-Tzong Liang
    2016-10-18 17:06:38
    Hi Sachin,

    I didn't see the IZTYPE header so that I guess you haven't entered the origin time. If you intend to make OMARKER be zero to have the travel time, all you need to do is to give the event origin time in the SAC header variables:
    SAC> ch O GMT year jday hour min. sec. msec
    SAC> ch allt ( 0.0 - &1,O ) iztype io
    SAC> wh

    Wen-Tzong Liang
  • Milton Plasencia
    2016-10-19 01:52:41
    Hi Sachim,

    What is origin time of event?
    what would be the correct value of OMARKER for you?

    M.

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

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

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

    On Oct 18, 2016, at 18:15, Sachin Tiwari <sachinism15<at>gmail.com> wrote:

    Dear Sac_help users,

    I have some sac data from HYB station located on Indian Shield at Hyderabad. OMARKER doesn't seem to be set at correct value. I requested seed data file and extracted sac data using rdseed using summary file to put the event information in the sac headers.

    I am not sure what could be the problem. Any suggestion regarding this?

    NPTS = 87180
    B = 3.000000e-04
    E = 4.358951e+03
    IFTYPE = TIME SERIES FILE
    LEVEN = TRUE
    DELTA = 5.000000e-02
    IDEP = UNKNOWN
    DEPMIN = -8.237908e+02
    DEPMAX = 9.231357e+02
    DEPMEN = -6.515828e-01
    OMARKER = 67963
    KZDATE = JAN 08 (008), 2000
    KZTIME = 01:27:17.044
    KSTNM = HYB
    CMPAZ = 9.000000e+01
    CMPINC = 9.000000e+01
    STLA = 1.741700e+01
    STLO = 7.855300e+01
    STEL = 5.100000e+02
    STDP = 0.000000e+00
    EVLA = -1.048570e+01
    EVLO = 1.121649e+02
    EVDP = 2.000000e+00
    KHOLE =
    DIST = 4.815776e+03
    AZ = 3.095449e+02
    BAZ = 1.274029e+02
    GCARC = 4.326407e+01
    LOVROK = TRUE
    NVHDR = 6
    NORID = 0
    NEVID = 0
    LPSPOL = FALSE
    LCALDA = TRUE
    KCMPNM = BHE
    KNETWK = G
    MAG = 5.300000e+00

    Any help will really be appreciated.

    Thanks and regards,

    Sachin Tiwari
    IIT (ISM),Dhanbad

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