Thread: lacking GCARC, EVDP, EVLA, EVLO header infornmation and relative time

Started: 2010-08-26 18:06:06
Last activity: 2010-08-26 22:54:08
Topics: SAC Help
Hi all,

I am not sure whether I have successfully sent this email before but I
really need someone to help.

My SAC files 1) lost GCARC, EVDP, EVLA, EVLO header information; 2) time
appears to be absolute instead of relative(B = 0.000000e+00) when I used
"rdseed -dpf" to extract SAC from seed.

What should I do to get those above header informations?
I used JWEEDv3.12 to get the seed files and rdseed 5.0 to extract.

Thank you in advance!!

Panxu

  • Your earlier message did get delivered, but I do not use JWEED so did not
    respond.

    I assume you have no event information (you did not mention BAZ and AZ,
    but I am guessing they are not there).

    In general you should incude information about platform and SAC version,
    but I doubt those are relevant for your problem.

    Hopefully someone who uses your kind of processing can comment, but I
    suggest you try a sample event file that you access using a different
    method and make sure your calls to RDSEED are as they should be.

    On Thu, 26 Aug 2010, Panxu Zhang wrote:

    Hi all,

    I am not sure whether I have successfully sent this email before but I
    really need someone to help.

    My SAC files 1) lost GCARC, EVDP, EVLA, EVLO header information; 2) time
    appears to be absolute instead of relative(B = 0.000000e+00) when I used
    "rdseed -dpf" to extract SAC from seed.

    What should I do to get those above header informations?
    I used JWEEDv3.12 to get the seed files and rdseed 5.0 to extract.

    Thank you in advance!!

    Panxu





    • Thank you for alerting us to this problem, Panxu. We'll see if we
      can help you with tracking down the cause.

      Did you write your SEED files directly from JWEED? Were these
      miniSEED files or was it full SEED with hypocenter information in the
      header?

      -Rob

      On Aug 26, 2010, at 12:35 PM, Arthur Snoke wrote:

      Your earlier message did get delivered, but I do not use JWEED so
      did not respond.

      I assume you have no event information (you did not mention BAZ and
      AZ, but I am guessing they are not there).

      In general you should incude information about platform and SAC
      version, but I doubt those are relevant for your problem.

      Hopefully someone who uses your kind of processing can comment, but
      I suggest you try a sample event file that you access using a
      different method and make sure your calls to RDSEED are as they
      should be.

      On Thu, 26 Aug 2010, Panxu Zhang wrote:

      Hi all,
      I am not sure whether I have successfully sent this email before
      but I
      really need someone to help.
      My SAC files 1) lost GCARC, EVDP, EVLA, EVLO header information; 2)
      time
      appears to be absolute instead of relative(B = 0.000000e+00) when I
      used
      "rdseed -dpf" to extract SAC from seed.
      What should I do to get those above header informations?
      I used JWEEDv3.12 to get the seed files and rdseed 5.0 to extract.
      Thank you in advance!!
      Panxu

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06:02:44 v.f0c1234e