Thread: deconvolution

Started: 2020-10-29 10:43:08
Last activity: 2020-10-29 23:44:17
Topics: SAC Help
Carmen Pro
2020-10-29 10:43:08
Hi sac users,

In the deconvolution procedure to recover ground velocity or displacement, I have observed in several records for the 1997-11-28 Bolivia earthquake that a new frequency is introduced at the beginning of the seismogram. This is very confusing because the character of the first arrival seems changed. As an example, the case of station SJG is attached.

Could you tell me the reason and how to solve it?

Thank you very much

Regards

Carmen Pro
--
_________________________________________
Dra. Carmen Pro Muñoz
Dpto. Física- Universidad de Extremadura
Centro Universitario de Mérida
c/ Sta. Teresa de Jornet, nº 38
06800 Mérida (Badajoz)
Tfo. 34 924 673 044
34 924 289 300- ext: 82544
http://kraken.unex.es/
____________________________________

Attachments
  • Geo .
    2020-10-29 23:44:17
    Hi Carmen,
    You haven't told us how you are deconcolving your instrument response. What
    options are you using? EVALRESP/POLEZERO, FREQlimits etc. You can most
    certainly solve this issue by adjusting FREQlimits (f1,f2,f3,f4).

    Januka

    On Thu., 29 Oct. 2020, 8:48 pm Carmen (via IRIS), <
    sac-help-bounce<at>lists.ds.iris.edu> wrote:

    Hi sac users,

    In the deconvolution procedure to recover ground velocity or displacement,
    I have observed in several records for the 1997-11-28 Bolivia earthquake
    that a new frequency is introduced at the beginning of the seismogram. This
    is very confusing because the character of the first arrival seems changed.
    As an example, the case of station SJG is attached.

    Could you tell me the reason and how to solve it?

    Thank you very much

    Regards

    Carmen Pro
    --
    _________________________________________
    Dra. Carmen Pro Muñoz
    Dpto. Física- Universidad de Extremadura
    Centro Universitario de Mérida
    c/ Sta. Teresa de Jornet, nº 38
    06800 Mérida (Badajoz)
    Tfo. 34 924 673 044
    34 924 289 300- ext: 82544
    http://kraken.unex.es/
    ____________________________________

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