| 起伏地表条件下各向异性地震波最短路径射线追踪 |
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| 引用本文： | 赵后越, 张美根. 起伏地表条件下各向异性地震波最短路径射线追踪[J]. 地球物理学报, 2014, 57(9): 2910-2917, doi: 10.6038/cjg20140916 |
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| 作者姓名： | 赵后越 张美根 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所, 中国科学院油气资源研究重点实验室, 北京 100029; 2. 中国科学院大学, 北京 100049 |
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| 基金项目： | 高放废物地质处置研究开发项目、国家重大科研装备研制项目（ZDYZ2012-1）-06子项目-05课题联合资助. |
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| 摘 要： | 在地震波正反演研究中，考虑起伏地表和地震各向异性具有非常重要的理论意义和实际应用价值.本文在前人研究的基础上，将最短路径追踪算法引入到起伏地表各向异性介质模型的地震波走时计算中.模型剖分时，整体模型划分成正方形单元，起伏边界附近以不规则网格逼近，进而采用非规则节点布置实现非规则网格处的最短路径计算.追踪计算中采用Sena群速度近似公式，得到各向异性地震波的走时，实现了复杂地表情况下各向异性介质模型中地震波的射线追踪.理论模型计算结果显示，本文方法能够可靠地应用于复杂各向异性介质模型，具有较高的计算精度.
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| 关 键 词： | 起伏地表 各向异性 最短路径射线追踪 |
| 收稿时间： | 2014-03-06 |
| 修稿时间： | 2014-08-29 |
Tracing seismic shortest path rays in anisotropic medium with rolling surface |
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| ZHAO Hou-Yue, ZHANG Mei-Gen. Tracing seismic shortest path rays in anisotropic medium with rolling surface[J]. Chinese Journal of Geophysics (in Chinese), 2014, 57(9): 2910-2917, doi: 10.6038/cjg20140916 |
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| Authors: | ZHAO Hou-Yue ZHANG Mei-Gen |
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| Affiliation: | 1. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | It has very important theoretical and practical values to take rolling surface and seismic anisotropy into consideration in seismic forward modeling and inversion. Based on previous researches, the shortest path calculation algorithm is introduced in this paper to calculate seismic travel times in anisotropic media with rolling surface. In the process of model gridding, the whole model is divided into square cells firstly and rolling boundary is regarded as the approximation of units with irregular shapes. Then shortest path calculation is achieved on irregular grids by setting irregular nodes. Sena's group velocity approximation is used to calculate seismic travel times in anisotropic media during ray tracing, and seismic shortest path ray tracing in a complex anisotropic medium with rolling surface is achieved in the end. Theoretical model calculations show that the method in this paper can be reliably applied to complex anisotropic models with higher calculation accuracy. |
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| Keywords: | Rolling surface Anisotropy Shortest path ray tracing |
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