The application of the perfectly matched layer in numerical modeling of wave propagation in poroelastic media

The perfectly matched layer (PML) was first introduced by Berenger as a mat erial absorbing boundary condition (ABC) for electromagnetic waves. In this paper, a method is developed to extend the perfectly matched layer to simu lating seismic wave propagation in poroelastic media. This nonphysical mate rial is used at the computational edge of a finite-difference algorithm as an ABC to truncate unbounded media. The incorporation of PML in Biot's equa tions is different from other PML applications in that an additional term i nvolving convolution between displacement and a loss coefficient in the PML region is required. Numerical results show that the PML ABC attenuates the outgoing waves effectively.