POWER SPECTRUM FOR EARTHQUAKE SIGNAL USING HILBERT HUANG TRANSFORM

Abstract

Hilbert Huang Transformation method is used to analyze non-stationary signals. Unlike most existing methods this method does not need assumptions of peace-wise stationarity or analytical function forms of spectra. Application to earthquake ground motion by using EMD method introduced by Huang is used to disintegrate Earthquake data into IMFs. Hilbert transform of IMF is used to find Hilbert marginal spectrum, three dimensional frequency time plot and power spectra.