一阶速度-应力弹性波方程高阶交错网格高阶有限差分数值模拟，PML吸收边界条件-An order velocity- stress elastic wave equation order staggered grid high-order finite difference numerical simulation, PML absorbing boundary conditions

基于声波方程有限差分数值模拟，这是中国海洋大学场论1课程的大作业。-Finite difference based on acoustic wave equation, which is the China Ocean University Field Theory 1 course a big operation.