程函方程差分法层析成像

在程函方程差分解法的基础上，本人曾给出了在已知二维空间网格点上的初步走时来一次求出所有接收点至激发点之间的地震初至波射线路径，从而利用瞬时迭代重建技术实现了任意两维地下介质速度分布情况下的弯曲射线法层析成像反演算法。

Crosshole seismic tomography based on a finite difference solution of the eikonal equation

Based on finite difference solution of the two dimensional eikonal cquation, the author has presented a paper on a fast raytracing method of seismic first arrival raypaths for all rcceivers to its source from first arrival times on discrete grids. A bend ray seismic tomographic invcrsion method suitablc to any velocity distribution has beon foundcd by using a simultaneous image reconstruction technique (SIRT). By this method,we have processed many mathematical model data, physical laboratory model data and field crosshole seismic data from Jilin province in northcast China,and obtaincd very good resulis,These results have shown that firstly solving the 2-D eikonal equation,then tracing the raypath from known times and finally invcrsion by SIRT technique is an effective means for seismie tomography.