Polarization of Near-fault Long-period Ground Motion

Abstract

Through the analysis of typical near-fault ground motion, the inhomogeneity of the spatial distribution of long-period ground motion intensity on the fault parallel component (FP) and normal component (FN) is revealed. The study shows that the intensity of long-period ground motion on the fault parallel component is higher than that of on the fault normal component. This may be due to the fact that the velocity pulse is more easily formed on the fault parallel component higher than that of on the fault normal component, and the velocity pulse is more intense. The study is of great significance to the establishment of the attenuation relationship of near-fault ground motion and the seismic fortification of near fault structures.