The Absorbing Boundary Condition In Numerical Simulation Of Seismic Wave Propagation

The numerical simulation of the seismic wave propagation is of grow-ing interest in seismic exploitation for oil and natural gas. It helps todirect the work of collecting, processing data and phenomena explana-tion. It is also an important way to help to validate imaging methodsand seismic exploration research.Another important problem in the numerical simulation of the seis-mic wave is how to convert the physics model in infinite domain intothe one in finite domain. In the process of this transform, a man-causedboundary is added and be called as artificial boundary. And then, todevelop some proper boundary conditions is a problem that can't beignored. The purpose of this paper is to discuss and compare three arti-ficial boundary conditions—Clayton-Engquist absorbing boundary con-dition, MTF, PML absorbing boundary condition, especially to developPML formula of the elastic equation which in the form of displacementand point out the advantage of PML.In the different models, finite element method or finite differencemethod is used to discrete the elastic equation and its correspondingartificial boundary conditions.For some simple media and complicated media, a few of numericalexamples are demonstrated. The results of numerical experiment vali-date the effectiveness of PML absorbing boundary condition.