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《Progress In Geophysics》 2003-01
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Improvement of shortest path ray tracing method

ZHANG Jian zhong 1 ,CHEN Shi jun 2 ,YU Da xiang 3(1. College of Computer and Information Engineering, Xiamen University, Xiamen, 361005, China; 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100101, China; 3. Shengli Oil Field, Dongying, 257022, China)  
The principle and method of seismic raytracing with shortest path algorithm in networks are discussed, the relevant drawbacks in which and improved measures are also analyzed. Especially, we develop a shortest path raytracing method with dynamic networks based on the shortest path algorithm. The wavefront times are sampled at the nodes away from the source throughout the entire model. The first arrival times at nodes in a cell are expressed with linear interpolation between traveltimes obtained aforehand at each pair of two neighboring nodes, and then determined by Fermat principle. After the first arrival times being sampled throughout the model, the raypaths from the source to each receiver are obtained backward away from the receiver to source in the same way as the forward sampling. This algorithm is regardless of model complexity, and has a higher precision for computation of seismic traveltimes and raypaths.
【CateGory Index】: P631
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