Simulation and analysis of point-source surface wave fields  

作　　者：Chengyu Sun Xingyao Yin Yunfei Xiao 

机构地区：[1]China University of Petroleum, Qingdao 266555, China [2]Geophysical Research Institute, SINOPEC, Nanjing 210014, China

出　　处：《Earthquake Science》2011年第5期419-426,共8页地震学报（英文版）

基　　金：support of the Major National Science and Technology Projects(No.2011ZX05006-002);the Fundamental Research Funds for the Central Universities of China(No.09CX04009A)

摘　　要：The complexity of near surface intensifies the diversity of seismic wave fields, which makes study on near surface wavefields important in many aspects. The strong absorption of low velocity layer can affect the resolution of seismic data, and free boundary can cause surface wave. Considering the above problems, we focus on the Rayleigh wavefields simulation using finite-difference wave equation of higher-order staggered grids and PML boundary conditions. Free boundary, buried source and overlying low velocity layer are taken into consideration and point explosion source is adopted. Through some numerical simulation with different parameters, we quantitatively analyze relationship between wave intensity and source depth, as well as the energy variation with propagation and obtain some practical knowledge and conclusions.The complexity of near surface intensifies the diversity of seismic wave fields, which makes study on near surface wavefields important in many aspects. The strong absorption of low velocity layer can affect the resolution of seismic data, and free boundary can cause surface wave. Considering the above problems, we focus on the Rayleigh wavefields simulation using finite-difference wave equation of higher-order staggered grids and PML boundary conditions. Free boundary, buried source and overlying low velocity layer are taken into consideration and point explosion source is adopted. Through some numerical simulation with different parameters, we quantitatively analyze relationship between wave intensity and source depth, as well as the energy variation with propagation and obtain some practical knowledge and conclusions.

关 键 词：near surface point source free boundary Rayleigh wave wave field simulation 

分 类 号：P315.31[天文地球—地震学]