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A Multi-Axial Perfectly Matched Layer for Finite-Element Time-Domain Simulation of Elastic Wave Propagation

Summary We develop a novel M-PML absorbing boundary condition for the second-order finite-element elastic wavefield simulation. We first derive the M-PML formulation and then incorporate the M-PML into the second-order wave formulation in the time domain with fewer split terms to reduce memory requirement and consequentially improve the computational efficiency. Numerical wavefield simulations are carried out to demonstrate the stability and efficiency of the proposed M-PML. The proposed algorithm can also be extended to 3D anisotropic elastic simulation of wave propagation with reasonable efforts.