Thread: Output envelope waveform in SAC

Started: 2019-06-14 15:00:49
Last activity: 2019-06-14 22:36:36
Topics: SAC Help
Abhash Kumar
2019-06-14 15:00:49
Hi,
I want to calculate and plot envelope waveforms in SAC. I am reading
several waveforms recorded at multiple stations of a seismic network. I
decimated the data using decimate function and saved them as separate SAC
files. I read those decimated files and typed "envelope" in the SAC
terminal. According to the SAC manual, envelope command computes the
envelope function of the data in memory, but I don't understand how to save
the output of envelope command as separate SAC files to plot later. I would
much appreciate any suggestions.

Thanks
Abhash

  • Milton Plasencia
    2019-06-14 22:36:36
    Hi,

    If I understand correctly, you can try:

    sac> r eq_dec.sac
    sac> p
    sac> envelope
    sac> p
    sac> w eq_dec_env.sac

    Where eq= waveform of earthquake; dec=decimated; env=envelope

    HTH,

    Milton




    On 14 Jun 2019, at 21:01, Abhash Kumar <abhash.kumar84<at>gmail.com> wrote:

    Hi,
    I want to calculate and plot envelope waveforms in SAC. I am reading several waveforms recorded at multiple stations of a seismic network. I decimated the data using decimate function and saved them as separate SAC files. I read those decimated files and typed "envelope" in the SAC terminal. According to the SAC manual, envelope command computes the envelope function of the data in memory, but I don't understand how to save the output of envelope command as separate SAC files to plot later. I would much appreciate any suggestions.

    Thanks
    Abhash

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