地震初至波走时的有限差分计算  

FINITE DIFFERENCE CALCULATION OF SDIEMIC FIRST-ARRIVAL TRAVELTIME

作　　者：张霖斌[1] 姚振兴[1] 纪晨[1] 

机构地区：[1]中国科学院地球物理研究所

出　　处：《地球物理学进展》1996年第4期47-52,共6页Progress in Geophysics

摘　　要：本文提出了用有限差分解程函方程求取地震初至波走时的快速、精确方法．算法考虑了首波、散射波并采用新的延拓方法，在任意复杂的速度结构中能得到精确的结果。本方法对叠前偏移、层析成像是非常适宜的。A fast accurate method for calculation of firstarrival traveltime with finite difference approximation to the eikonal equation is presented in this paper. In this method, refracted and diffraction waves are considered and a new extrapolation procedure is used. The accurate solutions could be obtained even for medium with strong inhomogeneities. the method is well suited for prestack migration and tomography.

关 键 词：程函方程 地震 初至波走时 有限差分 地震波 

分 类 号：P315.3[天文地球—地震学] P315.63[天文地球—固体地球物理学]