科研之友
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摘要
Grid point traveltimes calculated by linear traveltime interpolation (LTI) are not always the minimum values for not considering all the possible ray directions. It induces that Fermat condition of minimum traveltime can not be really satisfied in ray tracing. In the paper an improved method for ray tracing is presented to solve this problem. By making use of multidirectional loop computation the minimum traveltimes of all grid points are obtained, which will conform the traced ray path to the condition of minimum traveltime. The tracing precision can be ensured in this way. The calculation examples show that the improved method can increase the precision effectively comparing with the traditional LTI in the velocity structure of great difference.
- 出版日期2009-1
- 单位武汉大学
