DETECTION OF STEP AND PULSE COMPONENTS AND ESTIMATION OF DISPLACEMENT WAVEFORM BASED ON NEAR-FAULT SEISMIC GROUND MOTION RECORD

Abstract

In this study, a method for detecting the step and pulse components as well as estimating the displacement waveform based on seismic ground motion records was developed. These components represent the residual displacement and pulse-like ground motion in the near-fault region. In addition, the displacement waveforms were synthesized by combining the observed Fourier spectrum and obtained model spectrum instead of using a low-cut filter. Applying the proposed method to strong ground motion records during the mainshock of the 2016 Kumamoto earthquake, the displacement waveforms containing the step and pulse components were appropriately estimated.