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

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

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

- Rozana offline
**Posts:**1**Joined:**30 Mar 2011, 09:03

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

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

- seismosoft offline

**Posts:**356**Joined:**06 Jul 2007, 04:55

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