Design and implementation of forward modeling algorithm for anisotropic seismic waves

Abstract

Computer numerical simulation is used to study the propagation law of seismic waves in underground media, which is one of the most practical and convenient research methods in the field of seismic exploration in modern geophysics. Due to the many anisotropy parameters of elastic wave, the calculation in the simulation process is large and time-consuming. This paper propose the idea of using acoustic waves for simulation. Acoustic anisotropy theory sets the velocity of the shear wave part of the elastic wave to zero and eliminates many of its parameters. This paper propose the idea of staggered mesh finite difference to discretize the acoustic wave equation. The purpose is to convert the differential equation into a difference equation. The homogeneous medium model and layered medium model are used in the forward modeling process. This paper use the perfectly matched layer(PML) boundary absorption algorithm to process the wave propagating to the model boundary. The experimental results show that our algorithm is correct and of great significance to the study of seismic wave propagation in earth media.