COHERENCY FUNCTION MODEL OF GROUND MOTIONAT BASE-ROCK

摘要

At present, the method to study spatial variation of ground motions is statistic analysis based on densearray records such as SMART-1 array, etc, to get coherency function of ground motion, which would beused to depict the variation with space and frequency. But there is no coherency function model of baserock.In this paper, spatial variation of stochastic ground motions at base-rock, which considering thefactors of rupture velocity, numbers of sub-source, depth of epicenter and propagation velocity, is studiedfrom near-field ground motions which are simulated by elastic half-space model with dislocation source offault. In the case of lack of statistic coherency function of base-rock, the results of this paper are usefuland could be referenced.