Absorbing Boundary Conditions in 3D Elastic-Wave Numerical Modeling
三维弹性波数值模拟中的吸收边界条件

The absorbing boundary conditions to avoid the artificial boundary reflections must be required in the numerical simulation of seismic wave propagation. In this paper, on the base of paraxial approximations, we present a set of absorbing boundary conditions of 3D elastic wave equations and apply to the 3D elastic wave numerical modeling in isotropic medium. The snapshots of the theoretical and salt model show that they reduce artificial reflections to a great extent and absorb energy over a wide range of incident angles. Since using forth order approximations, they save computer storage and are convenient to implement.