How to calculate Standard Deviation from Spectral Ratios

Discuss here all technical and scientific questions about the processing of ambient vibrations for site characterization (H/V, Array methods,...)
rizhu
Posts: 3
Joined: Tue Feb 25, 2014 9:10 pm

How to calculate Standard Deviation from Spectral Ratios

Postby rizhu » Wed Apr 09, 2014 2:53 pm

Hello all Geopsy users.

I'm trying to calculate the standard deviation (with seismic analysis code, sac from iris) 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.

sbirro
Posts: 7
Joined: Tue Dec 27, 2011 2:10 pm

Re: How to calculate Standard Deviation from Spectral Ratios

Postby sbirro » Tue May 06, 2014 7:26 am

Hello,

it should be the geometric sample standard deviation.

You can read the formula in the Deliverable D08.02, pag. 8. It is one of the deliverables of the SESAME project. Since the SESAME project website seems discontinued, look for it using the Internet Wayback Machine (http://archive.org/web/web.php).

Riccardo


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