Author(s)

H. Kawakami & H. Mogi

Abstract

Examining spatial intra-event variability of peak ground accelerations as a function of separation distance H. ~awakami' & H. ~ o ~ i ~ ' ~ e o s ~ h e r e Research Institute of Saitama University, Japan 2 Department of Civil and Environmental Engineering, Saitama University, Japan Abstract Peak ground acceleration (PGA) as a measure of earthquake motion intensity is an important factor in the earthquake-resistant design and reliability analysis of structures. The purpose of this paper is to examine the spatial variability of PGAs (recorded at the same epicentral distance) as a function of separation distance. To do this, we define PGA ratios as spatial intra-event variations of PGAs and examine their statistical characteristics. We analyze the probability distribution of the ratios, and formulate equations for their probability density functions, mean values, standard deviations and percentiles. The above-mentioned statistics are then estimated using accelerometer arrays of the Chiba, SMART-

Keywords