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A simplification method of earthquake ground motion using sinusoidal waves is proposed. The method has the advantages of wavelet analysis, suitable for non-stationary states, and Fourier analysis, suitable for stationary states, through extracting the best-matched waveforms using multiple wavelets. The proposed method was formulated and applied to an acceleration waveform observed in the 1995 Kobe earthquake in addition to a frequency-swept sinusoidal waveform. The results showed the method appropriately extracted both non-stationary and stationary waveforms. This method could be utilized to resolve a waveform into various waveform components caused by different propagation paths.

EXTRACTION METHOD OF SINUSOIDAL WAVES FROM EARTHQUAKE GROUND MOTION TO SIMPLIFY THE MOTION