地震声波有限元模拟在微机上的实现

有限元法是复杂介质地震模拟的有力工具，它能比较客观地反映地震波的传播过程，比较细致地再现地震图像。但由于有限元地震模型所需网格节点数很多，数据规模巨大，使得它的计算受到限制。本文采用对角线化矩阵、运用吸收边界条件等办法，使有限元计算所需的内存降低(比有限差分法所需内存还少)、计算时间减少，在微机上实现了比较复杂地质模型的有限元地震声波模拟的计算。文中还对有限元计算精度作了简单地分析，最后给出了在微机上计算的合成地震记录。结果表明:该方法精度高、计算时间比相应的有限差分法短、记录波场丰富，是一个行之有效的地震声波模拟方法。

Modeling the seismic acoustic wave by finite element method on microcomputer

Finite element method is an useful tool for modeling seismic wave in complex medium,it simulates seismic wave propagation quite realistically and displays seismic wave fields in quite detailed way. Its performance on microcomputer is restricted because of both too many grid points and tremendous data which are needed in the finite element modeling.The use of diagonalization matrix,absorption boun- dary condition and so on reduces computaion time and the needed storage,which is thus less than the storage used in finite difference method.As aresult,the computation for finite element modeling of seismic acoustic wave from quite complicated geological model is acc- omplished on microcomputer.The accuracy of fininte element compu- tation is briefly analysed,and the synthetic seismic record made with microcomputer is shown.It is shown that this method is effectual seismic acoustic modeling method because of its high accuracy,rich wave field and less computation time than the time taken by finite difference method.