High Resolution Simulation of Seismic Wave Propagation in Realistic Media with Complex Geometry

对地球内部结构及其地球物理性质的研究主要以地震学成果为基础。今天，对地震波传播的计算机模拟为理解地震波现象、其产生及其后果提供了宝贵的工具。然而，在具有复杂几何形状的真实介质中模拟一个完整的、高精度的波场仍然是一个巨大的挑战。因此，拟议的研究项目的目标是研究和开发一种高度灵活和强大的模拟方法，该方法能够包含介质的不同材料属性、动态地震破裂过程以及复杂的内部材料边界和地形。所谓的Ader间断Galerkin方法具有求解控制偏微分方程解的数值格式具有任意高逼近阶的独特性质。通过这种高精度算法的发展及其与最新的高性能计算机技术的结合，我们的目标是解决数值地震学中的实际问题，以改进强震后的地面运动预测，更准确地估计局部地震危险性和危险性，并促进勘探地震学中的储层监测和油气勘探。

Research on the interior structure of the earth and its geophysical properties are mainly based on results of seismology. Today, computer simulations of the propagation of seismic waves represent an invaluable tool for the understanding of the wave phenomena, their generation and their consequences. However, the simulation of a complete, highly accurate wave field in realistic media with complex geometry is still a great challenge. Therefore, the aim of the proposed research project is the study and development of a highly flexible and powerful simulation method able to incorporate different material properties of a medium, dynamic earthquake rupture processes, and difficult internal material boundaries as well as topography. The so-called ADER-Discontinuous Galerkin method has the unique property of a numerical scheme that achieves arbitrarily high approximation order for the solution of the governing partial differential equations. By the development of such highly accurate algorithms and their combination with latest high performance computer technology we aim for the solution of actual problems in numerical seismology in order to improve ground motion prediction after strong earthquake events, to estimate local seismic hazard and risk more precisely, and to advance reservoir monitoring and hydrocarbon exploitation in exploration seismology.