Thread: Noise spectrum of seismic waveform

Hi,
If you want the noise spectrum relative to the P phase, your noise window
should terminate before the P wave arrival time. If you define your noise
window accurately, computing the noise spectrum with the FFT function
should be straightforward.
https://ds.iris.edu/files/sac-manual/commands/fft.html

Januka

Januka Attanayake
Research Fellow | Earthquake Seismology
Homepage: *https://sites.google.com/site/janukaattanayake
https://sites.google.com/site/janukaattanayake*

School of Earth Sciences | McCoy Bldg. 200
University of Melbourne | Parkville 3010 VIC
Australia




On Fri, 24 Jan 2020 at 03:56, nagarajugeo<at>gmail.com <nagarajugeo<at>gmail.com>
wrote:

Dear All,

I would like to calculate the noise spectrum of seismic waveform (waveform
length of 5 s : 2.5 s pre- and post- of P-phase). I tried it in sac,
however, I did not get it. Kindly suggest me the procedure for calculating
the noise spectrum.

thanking you

Kanna

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