How to calculate Standard Deviation from Spectral Ratios?

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rizhu
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Joined: Tue Feb 25, 2014 9:10 pm

How to calculate Standard Deviation from Spectral Ratios?

Postby rizhu » Fri Apr 04, 2014 5:48 pm

Hello all.

I'm trying to calculate the standard deviation (with seismic analysis code, sac) from spectral ratios and compare with those calculated by Geopsy.

Do you know the formula that Geopsy uses?

or

Do you know some article that explain this?

Thanks a lot.

admin
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Re: How to calculate Standard Deviation from Spectral Ratios

Postby admin » Mon Dec 01, 2014 3:18 pm

The curves computed for each time window are averaged on a log scale (geometrical mean). Geometrical standard deviations are thus computed.


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