How do I get the amplitude profile of an earthquake Signal?

I have El-Centro data. Using wavelet analysis,I have reconstructed the signal, I need to get a smooth plot of the amplitude profile which envelopes the Accel vs Time graph. Any idea how I should go about it?

TIA

Answer 1

[Chad Greene]

You can use one of the enveloping techniques discussed here.

Answer 2

[Star Strider]

Another option is to use the Hilbert transform, as described in Envelope Extraction Using the Analytic Signal (Signal Processing Toolbox).

[Samar Kenkre]

Would I have to take the absolute values of the hilbert transform?

[Star Strider]

Yes, according to the documentation.

I’ve used it on some of my signals, and it works.