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本文根据同一条射线路径上满足相同射线参数的原理，首先采用一个适合于任意界面情况下计算反（折）射点的一阶近似公式，从任意给定的初始路径出发进行逐段迭代计算，求出界面上的反（折）射点。然后以求出的射线路径为基础，按上述方法逐段求取下一界面的反（折）射点，直到终点得到整条射线为止。当整条射线路径上的界面反（折）射点的修正值达到精度要求时，则认为射线追踪结束。通过模型计算表明，本方法的计算速度比“打靶法”提高了一个数量级，其精度可以根据需要来确定。本方法无射线盲区，为任意界面的地震层析成像提供了一种准确、快速的方法。
Based on the principle that the same ray parameters are satisfied on the same ray path, a first-order approximation formula for calculating the anti-vertex points under any interface condition is first used to calculate iteratively from any given initial path, Find the interface of the anti (folding) point. Then, based on the ray path obtained, the antireflection point of the next interface is obtained piece by piece according to the above method until the end point gets the whole ray. When the correction of the antireflection point on the entire ray path reaches the accuracy requirement, the ray tracing is considered to be completed. The model calculation shows that the computational speed of this method is increased by one order of magnitude compared with “target shooting method”, and its accuracy can be determined as needed. The method has no ray blind zone and provides an accurate and fast method for seismic tomography of arbitrary interface.