程函方程 是使用WKB理论来近似波动方程时,在波动传播问题中碰到的非线性偏微分方程。它从电磁学的麦克斯韦尔方程组导出,并在物理 (波动)光学和几何 (射线)光学之间起连接作用。
用逆风有限差分方法计算程函方程;
The upwind finite-difference method is used for traveltime calculations;
当前实用性较强的射线追踪方法,包括波前法,最短路径法,走时插值法,程函方程有限差分法等。
More practical ray tracing methods currently include the wavefront method, the shortest path method, the travel time epenthesis method, the eikonal equation finite difference method, etc.
本文提出一种将局部算法与扫描算法相结合的、用有限差分解程函方程求取地震波初至时间的方法。
A new technique is given here, which combines partial algorithm with scanning algorithm and obtains wave arrival times by solving eikonal equation with the use of finite difference method.
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