射线追踪程序，用于天然地震中的层析成像，稍做修改可用于其他领域。-ray tracing program for the natural seismic tomography, can be used to make slight changes in other areas.

实现地震射线追踪和反演的frotran程序，适合地震勘探的同行,Seismic ray tracing implementation and inversion frotran procedures, seismic exploration for suitable peer