Modeling the dynamic process of tsunami earthquake by liquid-solid coupling model

作     者：蔡永恩 赵志栋 

作者机构：Department of GeophysicsPeking University 

出 版 物：《Earthquake Science》 (地震学报(英文版))

年 卷 期：2008年第21卷第6期

页      面：598-607页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：National Natural Science Foundation of China (40521002 and 40474013) 

主　　题：finite element fluid-solid interaction earthquake tsunami numerical modeling 

摘      要：Tsunami induced by earthquake is an interaction problem between liquid and ***-water wave equation is often used to modeling the tsunami,and the boundary or initial condition of the problem is determined by the displacement or velocity field from the earthquake under sea floor,usually no interaction between them is consid-ered in pure liquid *** this study,the potential flow theory and the finite element method with the interaction between liquid and solid are employed to model the dynamic processes of the earthquake and *** model-ing the earthquake,firstly the initial stress field to generate the earthquake is set up,and then the occurrence of the earthquake is simulated by suddenly reducing the elastic material parameters inside the earthquake *** is dif-ferent from seismic dislocation theory in which the relative slip on the fault is specified in *** modeling results reveal that P,SP and the surface wave can be found at the sea surface besides the tsunami *** surface wave arrives at the distance of 600 km from the epicenter earlier than the tsunami 48 minutes,and its maximum amplitude is 0.55 m,which is 2 times as large as that of the sea *** warning information can be taken from the surface wave on the sea surface,which is much earlier than that obtained from the seismograph stations on *** tsunami speed on the open sea with 3 km depth is 175.8 m/s,which is a little greater than that pre-dicted by long wave theory,(gh)1/2=171.5 m,and its wavelength and amplitude in average are 32 km and 2 m,*** the tsunami propagates to the continental shelf,its speed and wavelength is reduced,but its amplitude become greater,especially,it can elevate up to 10 m and run 55 m forward in vertical and horizontal directions at sea shore,*** maximum vertical accelerations at the epicenter on the sea surface and on the earthquake fault are 5.9 m/s2 and 16.5 m/s2,respectively,the later is 2.8 times the