Characterization of Near-Fault ground motion by acquiring Cumulative Pulse Extraction with Wavelet Analysis

In the last five decades vast implementation on the identification, characterization, and analysis of near-fault ground motions have been done. This paper investigates characterization of Near-Fault ground motion by acquiring pulse Extraction with Wavelet Analysis. Multiple pulses [with dominant period TP between 0.5 and 12 s] in historical near-fault ground motion records were used in this study. It presents an iterative method for extracting multiple pulses from a pulse-like near-fault ground motion whereby the sum of the extracted pulses generates a relatively accurate representation of the ground motion. The method that was used in this research is called the cumulative pulse extraction (CPE) method, this method was applied to 40 pulse-like ground motion records from 17 historical earthquakes with magnitudes ranging from 6.3 to 7.9, all recorded within 10 km from the fault rupture. This study used a set of strong (peak ground velocity > 0.6 m/s) near-fault ground motion records and focused on studying the characteristics of their pulse-like nature; the results presented do not reflect the rate of occurrence of one or more pulses occurring at a new fault site. For the CPEV-EN method, increasing the number of pulses used from one. To extract one pulse per iteration of the CPE method; a total of three pulses were extracted for each ground motion record. The level of representation achieved for each of the 40 records was studied by comparing the linear SDOF spectral displacement response of the extracted pulse representation and that of the ground motion record for periods T ranging between 0.5 and 10 s is effective.

Keywords:

Near-Fault ground motion , Cumulative Pulse Extraction , Wavelet Analysis , Near-Fault effect