Thread: SAC merge

Started: 2014-06-19 16:14:53
Last activity: 2014-06-19 22:57:13
Topics: SAC Help
John
2014-06-19 16:14:53
Hi friends,
I will appreciate if someone could tell me how works the command sac "merge" I do as the manual says but it doesn’t merge anything. I have tons of information to merge; each sac file has 10 minutes window time I need each file in 60 minutes , my mates says I need an script. Does someone have a model script or another way to merge my files.
Thanks in advance for your answers.

  • George Helffrich
    2014-06-19 22:57:13
    Dear Jhon Cruz Igme -

    The documentation seems clear, but without an example it is hard to critique your approach. Here is an example using data that you can compare to the description:

    SAC> fg seismogram ;* test data
    SAC> ch b (&1,e& + &1,delta&) ;* changes begin time to next sample
    SAC> w /tmp/hold ;* save modified data as an external file
    SAC> fg seismogram ;* seismogram in memory
    SAC> merge /tmp/hold ;* concatenate data following
    SAC> lh ;* show result


    FILE: SEISMOGR
    --------------
    NPTS = 2000 B = 9.460
    E = 29.450 IFTYPE = TIME SERIES FILE
    LEVEN = TRUE DELTA = 0.10E-01
    IDEP = VELOCITY (VOLTS) DEPMIN = -1.56928
    DEPMAX = 1.52064 DEPMEN = -0.985472E-01
    OMARKER = -43.2000 AMARKER = 10.4700
    FMARKER = 17.7800 KZDATE = MAR 29 (088), 1981
    KZTIME = 10:38:14.000 IZTYPE = BEGIN TIME
    KSTNM = CDV CMPAZ = 0.0
    CMPINC = 0.0 STLA = 48.0
    STLO = -120.0 KEVNM = K8108838
    EVLA = 48.0 EVLO = -125.0
    EVDP = 0.0 IEVTYP = AFTERSHOCK
    DIST = 373.063 AZ = 88.1471
    BAZ = 271.853 GCARC = 3.35746
    LOVROK = TRUE
    SAC> p1 ;* see result: two copies of data!
    SAC> quit

    You repeat MERGE commands to add further data to your (lengthening) seismogram.

    On 19 Jun 2014, at 15:14, jhon cruz igme wrote:

    Hi friends,

    I will appreciate if someone could tell me how works the command sac "merge" I do as the manual says but it doesn’t merge anything. I have tons of information to merge; each sac file has 10 minutes window time I need each file in 60 minutes , my mates says I need an script. Does someone have a model script or another way to merge my files.

    Thanks in advance for your answers.

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    George Helffrich
    george.helffrich<at>bris.ac.uk



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