Unified three-dimensional numerical simulation of seismic and tsunami wave propagation

我们发展了一种用单组运动方程合成地震波和海啸波传播的统一方法。将原有的方法和数值代码进一步推广到地形、水深和介质结构不均匀的三维空间。该方法在弹性运动方程中考虑了恒定重力，在平衡状态下用有限差分方法求解。我们成功地开发了适合在超级计算机上进行大规模并行数值模拟的全并行化数值程序。将该方法应用于2011年太平洋沿岸东北地区9级地震。模拟结果成功地再现了在海底海啸台和内陆地震台观测到的地震/海啸记录的特征。

We developed a unified method on synthesizing seismic- and tsunami- wave propagation by single set of equation of motion. The original method and numerical code is further extended to the three-dimensional space having realistic topography, bathymetry and inhomogeneous medium structure. This method takes constant gravity force into account to the elastic equation of motion, and solves it under the equilibrium state by using finite difference method. We succeeded in developing fully parallelized numerical code that is suitable to the large-scale parallel numerical simulation with supercomputers. The method is applied to the 2011 Pacific Coast of Tohoku Earthquake (M9). The simulation result successfully reproduced the feature of observed seismic/tsunami records observed at ocean-bottom tsunamater and inland seismic stations.