该代码主要是讲解射线追踪方法在地震正演中的应用，可以较好的用于实际地震数值模拟当作，本人写了好久可以当作学习材料的-The code is mainly to explain the ray tracing method in seismic forward in the application, can be better used as a numerical simulation of the actual earthquake, I wrote a long time can be us