各向同性层状介质高阶交错网格有限差分数值模拟

Numerical Simulation of Staggered-grid High-order Finite Different in Isotropic Layered Media

基于波动方程理论采用交错网格高阶有限差分方法,对弹性波在各向同性层状介质条件下进行了数值模拟。模拟结果表明:地质断层使得地震波变得异常复杂,断层界面可以引起地震波的相互转化,并且产生大量的界面散射,使反射波同相轴扭曲、截断甚至淹没,从而引起地震资料严重的低信噪比问题。研究结论对于防震减灾和地质灾害防治工作具有一定指导意义。

Based on the theory of wave equation,using the staggered-grid high-order finite different method,the numerical simulation of elastic wave in isotropic layered media is conducted. The simulation results show that the geological fault makes the seismic wave become complex. The fault interface can cause the seismic wave mutual transformation,and product a large amount of interface scattering,these can cause the event of reflected waves distortion,truncation even submerged,thus cause the serious problem of low signal to noise ratio of seismic data. The researching conclusions have certain guiding significance for earthquake disaster mitigation and geological disasters prevention.