Thread: Body wave magnitude using SAC

Started: 2013-11-10 13:06:34
Last activity: 2013-11-11 17:50:35
Topics: SAC Help
Amr El-Sharkawy
2013-11-10 13:06:34
My Dear Professors and collegues

I appreciate very well if you please can tell me how to calculate the body wave magnitude and surface wave mgnitude using the SAC software
I am waiting your kind response
Regards
amr

 
Amr El-Sharkawy
Seismologist, National Research Institute of

Astronomy and Geophysics, (NRIAG), Egypt.
e-mail:   amr_elsharkawy22<at>yahoo.com
              amr_elsharkawy22<at>nriag.sci.eg
Mobile: 01090201009

  • Sheila Peacock
    2013-11-11 17:50:35
    Dear Amr El-Sharkawy,

    Sac will do only two things to help you with
    magnitude calculation:

    1. Remove the instrument response to convert the trace
    to ground motion (use "transfer");
    2. Allow you to pick amplitude and period of the desired
    wave cycle (use "plotpk").

    Also, you can use the spectrogram function to see
    whether an arrival on which
    you want to determine a surface wave magnitude really
    is part of a dispersed Rayleigh wave train.

    The amplitude-distance correction (e.g. Gutenberg-Richter
    for body waves, Marshall-Basham for surface waves) has to
    be applied separately, outside SAC.

    The IASPEI manual of seismological observatory practice
    contains some general information:

    http://www.iaspei.org/projects/NMSOP.html

    Hoping this is useful.

    Sheila Peacock,
    Blacknest.


    -------- Original Message --------
    Subject: [SAC-HELP] Body wave magnitude using SAC
    Date: Sun, 10 Nov 2013 05:06:34 -0800 (PST)
    From: Amr El-Sharkawy <amr_elsharkawy22<at>yahoo.com>
    Reply-To: Amr El-Sharkawy <amr_elsharkawy22<at>yahoo.com>
    To: sac-help-owner<at>iris.washington.edu <sac-help-owner<at>iris.washington.edu>, sac-help<at>iris.washington.edu <sac-help<at>iris.washington.edu>



    My Dear Professors and collegues
    I appreciate very well if you please can tell me how to calculate the body wave magnitude and surface wave mgnitude using the SAC software
    I am waiting your kind response
    Regards
    amr
    Amr El-Sharkawy
    Seismologist, National Research Institute of
    Astronomy and Geophysics, (NRIAG), Egypt.
    e-mail: amr_elsharkawy22<at>yahoo.com
    amr_elsharkawy22<at>nriag.sci.eg
    Mobile: 01090201009


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