Problem with units

03-Unexpected behaviour/errors
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Rozana
Posts: 1
Joined: 30 Mar 2011, 09:03

Problem with units

Post by Rozana »

Can someone please tell me the units of Fourier Amplitude when I use SeismoSignal??
I don't understand why after I changed the units of my accelerogram, the Fourier Amplitude and Power Spectrum don't change.
Help me please!!
Thank you
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seismosoft
Posts: 1184
Joined: 06 Jul 2007, 04:55

Re: Problem with units

Post by seismosoft »

Dear Rozana,

When we introduce a given acceleration time-history using different units, for instance g and m/s^2, we obtain:

- different results for the Fourier Amplitude (e.g. if we introduce the accelerogram in m/s^2, the Fourier Amplitude will be 9.81 times larger with respect to when the accelerogram is introduced in g)

- same results for the Power Spectra Amplitude, given that it is a ratio of acceleration values.

Please do refer to the Help System, for details on the equations used in SeismoSignal to compute the aforementioned parameters.

Seismosoft Support
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