Wave tracing: Ray tracing for the propagation of band-limited signals: Part 1 — Theory
Wave tracing: Ray tracing for the propagation of band-limited signals: Part 1 — Theory
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DOI：
10.1190/1.2963514
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发表时间：
2008-10
期刊：
影响因子：
3.3
通讯作者：
K. Bube;J. Washbourne
中科院分区：
文献类型：
--
作者：
K. Bube;J. Washbourne
许多地震成像技术需要计算旅行时间和旅行路径。计算射线路径的方法通常基于高频近似。在头波等情况下，这些射线路径使走时最小化，但不是大部分能量行进的沿着路径。我们已经开发了一种新的方法来计算射线路径，使用射线弯曲的修改，我们称之为波跟踪;它计算的射线路径和走时，更符合路径和时间的带限信号在真实的数据比路径和时间获得使用高频近似。波跟踪缩短了射线路径，同时将射线路径保持在信号的特征频率的菲涅耳区内。
Many seismic imaging techniques require computing traveltimes and travel paths. Methods to compute raypaths are usually based on high-frequency approximations. In situations such as head waves, these raypaths minimize traveltime but are not paths along which most of the energy travels. We have developed a new approach to computing raypaths, using a modification of ray bending that we call wave tracing; it computes raypaths and traveltimes that are more consistent with the paths and times for the band-limited signals in real data than the paths and times obtained using high-frequency approximations. Wave tracing shortens the raypath while keeping the raypath within the Fresnel zone for a characteristic frequency of the signal.