地震学报2012，Vol.34Issue(2)：147-156,10.DOI:10.3969/j.issn.0253-3782.2012.02.003
地震波传播的三维伪谱和高阶有限差分混合方法并行模拟
Three-dimensional parallel hybrid PSM/FDM simulation of seismic wave propagation
摘要
Abstract
Based on the pseudospectral method (PSM) and higher-order finite difference method (FDM) for staggered grid, this paper presents a 3D parallel hybrid PSM/FDM scheme to simulate seismic wave propagation in heterogeneous medium. The spatial derivatives in the wave equations for the two horizontal directions are calculated with the efficient and high accuracy PSM operator, while the vertical derivatives are calculated with a high-order FDM operator. The localized FDM operation in vertical direction enables us to divide the 3D model into subregions, which are assigned to different processors of a PC cluster for 3D parallel computation. The accuracy of this scheme was verified by comparing our result with that of using discrete wave number method. To show the feasibility of the parallel scheme, we performed parallel simulation for a 3D sedimentary basin to show the effect of basin depth on ground motion. The simulation is carried out on PC cluster with 64 processors for a 67108864 grids mod-el. The dominated frequency for the simulated seismic wavefield is 1. 25 Hz.关键词
地震波场模拟/并行计算/三维模型/混合方法Key words
seismic wavefield modeling/ parallel computation/ 3D model/ hybrid method分类
天文与地球科学引用本文复制引用
秦艳芳,王彦宾..地震波传播的三维伪谱和高阶有限差分混合方法并行模拟[J].地震学报,2012,34(2):147-156,10.基金项目
国家自然科学基金项目(40874020,40821062)和国家公益性行业科研专项(20070804)联合资助. （40874020,40821062）
