Staggered-grid high-order finite-difference method in elastic wave simulation with variable grids and local time-steps
可变网格与局部时间步长的交错网格高阶差分弹性波模拟

Accuracy and efficiency are most urgent problems in elastic wave simulation. Staggered-grid is an effective method to improve the accuracy with high efficiency. By the combination of variable spatial grids and locally variable time-steps, a staggered-grid high-order finite-difference method with oddly arbitrarily variable spatial grids and arbitrarily variable local time-steps is presented. The numerical results show that the simulation accuracy and efficiency are raised effectively by removing oversampling both in space and time domain. Additionally, compared with the traditional method, this modeling method has advantages of simulating seismic wave propagation in the media with fractures, caves and complicated structures. It can describe such media in details, and has high accuracy and efficiency.