报告地点：教学行政楼706会议室
报告时间：2019-03-08 从 15:00 到 16:30
报告人：吴文波
报告人简介：
吴文波，博士，加州理工学院地震实验室博士后。2008年本科毕业于中国科学技术大学，获学士学位。2013年获中国科学技术大学地球物理硕士学位；2019年获普林斯顿大学博士学位。2019年2月至今于加州理工学院地震实验室博士后。主要研究方向为观测地震学（深部地球结构，俯冲带脱水过程等）及地震波传播数值模拟。
报告题目：A SEM-DSM hybrid method for modelling 3D source-side effects in teleseismic waves
报告内容简介
Teleseismograms play an important role in global seismology. Because most earthquakes occur in the regions with active tectonics, which have complex structures and therefore cause strong 3D effects in teleseismograms. Numerical simulations of wave propagation are able to accurately model these 3D effects. However, simulations of high frequency (e.g. 1 Hz or higher) wave propagation at the global scale is still prohibitive due to the limited computation capability. To overcome this difficulty, we proposed a hybrid method to efficiently compute teleseismic waveforms with 3-D source-side structures. By coupling the Spectral Element Method (SEM) with the Direct Solution Method (DSM) based on the representation theorem, we are able to limit the costly SEM simulation to a small source-side region and avoid computation over the entire space of the Earth. Our hybrid method reduces computational cost by more than two orders of magnitude when only source-side 3-D complexities are of concern. We have successfully used this hybrid method to investigate a series of problems in seismology, such as imaging 3-D structures of a subducting slab and studying source parameters with 3-D source-side complexities.