Thread: Wood-Anderson synthetic signal

Started: 2021-04-22 10:27:58
Last activity: 2021-04-22 22:43:37
Topics: SAC Help
k.rebeche@craag.dz
2021-04-22 10:27:58
hello;
i'am a seismology PhD student.
Currently i'm working on how to evaluate the local magnitude of my region,
but i found some difficulties to determinate the synthetic wood-andersson
seismograme .
my questions are:
when i use the commande transfer from polezero subtype fname to WA, do i
have to deconvoluate the instrument response or i use the raw signal
directly ?
and do i get the synthetic wood-anderson signal ? also, what is the unit
of the amplitude of Wood-Anderson signal ?
can you provide us more details about this methode please, thank you



  • Milton Plasencia
    2021-04-22 22:43:37
    Hi,

    Please, I recommend you read the help for the transfer command.
    sac> help transfer.

    Prior to running the command transfer you must read the "trace" data, and
    it is raw signal,
    so it includes the "effect"/"filter" of the sensor, so when you apply the
    transfer command it
    removes the sensor effect from your signal and puts the wood Anderson's
    one, as if the trace
    was recorded with a WA instrument.

    For local magnitude the WA output must be in displacement units.

    HTH,

    milton


    ************************************
    Milton P. PLASENCIA LINARES
    Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS
    Borgo Grotta Gigante 42/C
    (34010) Sgonico - Trieste - Italia
    Tel: +39 040 2140 156 (Udine)
    Tel: +39 040 2140 256 (Trieste)
    Cell.: +39 331 6481 935

    E-mail: mplasencia<at>inogs.it

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


    On Thu, 22 Apr 2021 at 21:41, k.rebeche<at>craag.dz (via IRIS) <
    sac-help-bounce<at>lists.ds.iris.edu> wrote:

    hello;
    i'am a seismology PhD student.
    Currently i'm working on how to evaluate the local magnitude of my region,
    but i found some difficulties to determinate the synthetic wood-andersson
    seismograme .
    my questions are:
    when i use the commande transfer from polezero subtype fname to WA, do i
    have to deconvoluate the instrument response or i use the raw signal
    directly ?
    and do i get the synthetic wood-anderson signal ? also, what is the unit
    of the amplitude of Wood-Anderson signal ?
    can you provide us more details about this methode please, thank you



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