一阶声波方程波场模拟，采用的是交错网格，二阶精度，pml边界-A first-order wave equation of wave-field simulation, using the staggered grid, second order accuracy, pml boundary

弹性波方程的地震波场的正演模拟，采用的是高阶精度--10阶，但是还没加边界-Elastic wave equation of seismic wave field forward modeling, using the high-order accuracy- 10 bands, but not Canadian border