Visualization of Strong Ground Motion from the 2011 Off Tohoku, Japan (Mw＝9.0) Earthquake Obtained from Dense Nation-Wide Seismic Network and Large-Scale Parallel FDM Simulation

摘要

Strong ground motion from the 2011 off Tohoku, Japan (Mw＝9.0) earthquake is demonstrated by high-resolution 3D parallel FDM simulation of seismic wave propagation using the Earth Simulator supercomputer. Complicated wavefield accompanying the earthquake in connection with the radiation of seismic wave from complex source rupture process and strong amplification of ground motion in complicated subsurface structure beneath populated cities are demonstrated by the comparison of visualized seismic wavefield derived by the computer simulation and observation from dense nation-wide seismic network. Good correspondence between simulation results and observed actual seismic wavefield promising us the effectiveness of the present simulation model for ground motion simulation which is applicable not only for reproducing strong ground motions for the past events but also for mitigating earthquake disasters associated with future earthquakes.