A GFDM with PML for seismic wave equations in heterogeneous media

摘要

The interior of the Earth is heterogeneous with different materials and may have complex geometry. The free surface can also be uneven. Therefore, the use of a meshless method “with the possibility of using an irregular grid-point distribution” can be of interest for modelling this kind of problem.This paper shows the application of GFDM to the problem of seismic wave propagation in 2-D. To use this method in unbounded domains one must truncate the computational grid-point avoiding reflection from the edges. PML absorbing boundary condition has then been included in the numerical model proposed in this work.