摘要
提出了一种快速准确的水平层状介质中两点间的射线追踪方法. 该方法对任意复杂的水平层状速度结构、任意大小的入射角都能稳定、快速、准确地收敛. 将本方法分别与伪弯曲法和Kim方法进行了比较. 结果表明: 本方法比伪弯曲法的计算效率和计算精度更高, 但是只适用于一维速度结构; 在入射角不大的情况下, Kim方法与本方法效果相当. 在大入射角的情况下, Kim方法失效, 但本方法能快速稳定地收敛到真解. 本文提出的射线追踪方法为很多实际地震问题提供了强有力的工具, 但适用范围仅限于水平层状介质.
A rapid and accurate method for two point ray tracing in horizontally layered velocity model is presented in this paper. Numerical experiments show that this method provides stable and rapid convergence with high accuracies, regardless of various 1 D velocity structures, takeoff angles and epicentral distances. This two point ray tracing method is compared with the pseudobending technique and the method advanced by Kim and Baag (2002). It turns out that the method in this paper is much more efficient and accurate than the pseudobending technique, but is only applicable to 1 D velocity model. Kim′s method is equivalent to ours for cases without large takeoff angles, but it fails to work when the takeoff angle is close to 90°. On the other hand, the method presented in this paper is applicable to cases with any takeoff angles with rapid and accurate convergence. Therefore, this method is a good choice for two point ray tracing problems in horizontally layered velocity model and is efficient enough to be applied to a wide range of seismic problems.
出处
《地震学报》
CSCD
北大核心
2005年第2期147-154,共8页
Acta Seismologica Sinica
基金
国家自然科学基金(40074008
40134010)资助.
关键词
射线追踪
水平层状介质
two point ray tracing
horizontally layered velocity model
