差分法による 3次元不均質場での地震波伝播の大規模計算

Abstract

The development of high-performance parallel computers such as the cluster of PCs and the Earth Simulator supercomputers made it possible for realistic 3-D simulation of seismic wave propagation and strong ground motions in heterogeneous structure. The seismic wavefield in heterogeneous structure is often evaluated numerically by solving equation of motions based on the finite-difference method (FDM). In the present paper, the FDM simulation of seismic wave propagation in heterogeneous structure is reviewed briefly with recently developed techniques such as for accurate representation of seismic phenomena in heterogeneous structure. Efficient techniques to reduce computational cost of the FDM simulation are also presented. The effectiveness of the vector-computing hardware for the FDM simulation and a parallel simulation technique are demonstrated with linearly increasing computational performance using large number of processors of the Earth Simulator.