| 计算最小走时和射线路径的界面网全局方法 |
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| 引用本文： | 刘洪,孟凡林.计算最小走时和射线路径的界面网全局方法[J].地球物理学报,1995,38(6):823-832. |
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| 作者姓名： | 刘洪 孟凡林 |
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| 作者单位： | 中国科学院地球物理研究所, 北京 100101 |
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| 基金项目： | 国家自然科学基金委员会、中国科学院、中国石油天然气总公司、大庆石油管理局联合资助 |
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| 摘 要： | 用慢度分块均匀正方形模型将介质参数化，仅在正方形单元的边界上设置计算结点，这些结点构成界面网．根据Ｈｕｖｓｅｎｓ和Ｆｅｒｍａｔ原理，由不断扩张、收缩的波前点扫描代替波前面搜索，在波前点附近点的局部最小走时计算中对波前点之间的走时使用双曲线近似，通过比较确定最小走时和相应的次级源位置，记录在以界面网点位置为指针的３个一维数组中．借助这些数组通过向源搜索可计算任意点（包括界面网以外的点）上的全局最小走时和射线路径．这一方法不受介质慢度差异大小限制，占内存少，计算速度较快，适于走时反演和以Ｍａｓｌｏｖ射线理论为基础的波场计算．
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| 关 键 词： | 界面网 全局最小走时 射线路径 波前扫描 双曲线近似 |
| 收稿时间： | 1994-01-20 |
THE INTERFACE GRID METHOD FOR SEEKING GLOBALMINIMUM TRAVEL-TIME AND THE CORRESPONDENT RAYPATH |
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| LIU HONG MENG FAN-LIN LI YOU-MING.THE INTERFACE GRID METHOD FOR SEEKING GLOBALMINIMUM TRAVEL-TIME AND THE CORRESPONDENT RAYPATH[J].Chinese Journal of Geophysics,1995,38(6):823-832. |
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| Authors: | LIU HONG MENG FAN-LIN LI YOU-MING |
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| Institution: | Institute of Geopysics, Academia Sinica, Beijing 100101 |
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| Abstract: | This method discretized the computed two-dimensional media into a networkconsists of a series of rectangular pixels,and put the computing network nodes onthe sides of each pixels.On the bases of Huygens'Principle and Fermat's Pinciple,we get the global minimum travel time on each nodes and their correspondingsecondary sources,using the wavefront point scanning instead of wavefront pointsorting,combined with the local minimum travel-time computing for each wavefront pionts using hyperbolic approximation.This method has the following characteristics,such as:1.high c.omputing precision,2.robusteness even in solving the media Wwith very high velocity differences,3.less memory is needed,4.the accurately Computed travel-time and corresponding raypath can be easily used in travel time inversion and the wavefield computation based on the Maslov ray theory. |
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| Keywords: | Interface grid network Global minimum travel time Raypath Wavefront point scanning Hyperbolic approximation |
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