- 责任者：Li Fei (State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Xu Tao
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(10)
- 关键词：三维地震法 ; three-dimensional seismic methods ; 射线追踪 ; ray tracing
- 页码：p.3514-3522
- 图表：8 illus., 46 refs.
- 分类号：1600
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
Seismic ray tracing plays a key role in earthquake location, seismic tomography, migration and many other applications. To overcome the difficulty caused by grid-based and layer- based modeling, we describe a 3D complex geologic model as an aggregate of arbitrarily shaped blocks separated by triangulated interfaces. Based on Fermat＇s principle of stationary travel time, we develop a segmentally iterative ray-tracing （SIRT） method for geological models with generally heterogeneous velocity distribution. The method falls into the bending method category, in which the path points are perturbed by a first-order explicit formula instead of traditional iterative methods. Numerical tests demonstrate that the perturbation scheme of ray tracing is effective in complex 3D heterogeneous block models.