地震地磁观测与研究2017，Vol.38Issue(1)：7-14,8.DOI:10.3969/j.issn.1003-3246.2017.01.002
首都圈地震动三维地形效应谱元法模拟
Simulation of three-dimensional topographic effects on seismic ground motion in Capital region based upon the spectral-element method
摘要
Abstract
The effects of topography on seismic ground motion of an MS 4.7 earthquake in Capital region were simulated based upon elastodynamic equation for 3D wave propagation, the spectral-element method, parallel computation environment, incorporated realistic 3D topography and attenuation of media. The simulated results show that the simulated time series is consistent with the recorded data much better; topographic effects due to great rough terrain on vertical components of seismic wave are bigger than those on two horizontal components. Large PGA values are almost located near mountain tops and ridges. Compared with the model without topography, the relative topographic amplification factors of PGA in the zone near the epicenter are -20.4%—174.6%, while the Z velocity component at different sites are in accordance with the pattern of amplification on mountain tops and ridges, and there is a decrease in valleys and brooks. It can be concluded that the effects of 3D realistic topography on seismic ground motion are more complex than those of the existing 2D generalized mode1.关键词
谱元法/地震动/地形效应Key words
spectral-element method/seismic ground motion/topographic effect引用本文复制引用
廖力..首都圈地震动三维地形效应谱元法模拟[J].地震地磁观测与研究,2017,38(1):7-14,8.基金项目
中国地震局地球物理研究所中央级公益性科研院所基本科研业务专项(项目编号:DQJB12B17) （项目编号:DQJB12B17）
