Classification and Characterization of Multi-Pulse Near-Fault Strong Ground Motion

• 1、Institute of Earthquake Engineering,Dalian University of Technology,Dalian Liaoning 116024
• 2、State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian Liaoning 116024

Abstract：In this paper Multiple Pulse Analysis(MPA) method is proposed to characterize and classify the near-fault earthquake characterizing multiple pulses based on wavelets method, totally 22 sets of horizontal strong ground motions whose closest distance to fault are all kept within 30 km from both Taiwan Chi-Chi earthquake and Japan Kobe earthquake are selected from the COSMOS virtual data center for analysis. The principle of MPA is depicted in details, and 17 sets of earthquake records chosen previously are classified as pulse-like ground motion with MPA method. Results indict that the MPA method gives a better representation and classification of near-fault earthquake records characterizing multiple pulses. Regression equation between the closest distance to fault and difference of direction between the strongest direction and the theoretical strongest direction and number of pulse have also been also provided.

Keywords： seismology near-fault wavelets analysis multi-pulse pulse direction