| 改进Moser方法二维初至波走时层析成像正演研究 |
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| 引用本文： | 韩佩恩,张学强.改进Moser方法二维初至波走时层析成像正演研究[J].CT理论与应用研究,2018,27(1):9-17. |
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| 作者姓名： | 韩佩恩 张学强 |
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| 作者单位： | 中国地质大学(武汉)地球物理与空间信息学院, 武汉 430074 |
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| 摘 要： | 地震层析成像是剖析地球内部结构与性质的主要手段之一。以二维初至波走时层析成像为研究方向，剖析Moser初至波走时层析成像的基本原理，指出在原始算法中走时计算误差较大和射线路径追踪存在的问题，讨论提出两种改进办法，分别是:（1）使用动态节点提高走时计算的精度；（2）使用多重链表散列改进波前节点的处理效率。通过均匀介质模型验证改进Moser方法在正演中比原始算法在计算精度上的大幅提高，其中五个动态节点模型相对误差可达0.1%，解决了原始方法存在的问题。另外实现了改进的Moser方法在Marmousi2复杂介质模型中的正演计算，从绘制的波前射线图中可以看出与理论预期的结果相符，从而证明了改进Moser方法的准确性。
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| 关 键 词： | 层析成像 初至波 射线路径 最小走时 Moser方法 |
| 收稿时间： | 2017-07-20 |
Forward Modeling of 2D First Arrival Traveltime Tomography Using Moser Method |
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| HAN Pei-en,ZHANG Xue-qiang.Forward Modeling of 2D First Arrival Traveltime Tomography Using Moser Method[J].Computerized Tomography Theory and Applications,2018,27(1):9-17. |
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| Authors: | HAN Pei-en ZHANG Xue-qiang |
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| Institution: | Institute of Geophysics & Geometrics, China University of Geosciences, Wuhan 430074, China |
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| Abstract: | Seismic tomography is one of the main techniques exploring the inner structure and characteristics of the Earth. The focus of the paper is the use of Moser method in 2D first arrival wave travel time tomography. We used the basic principle of travel time tomography to improve the forward modeling of Moser shortest path method. Moreover, we proposed two ways to fix the existing problems in travel time and ray path calculation: 1) using dynamic nodes to improve the precision of travel time calculation; 2) using multiple linked list hash to improve the efficiency of wave front nodes. By using the homogeneous medium model, we proved that the accuracy of the improved Moser method is much higher that of the original algorithm in forward modeling, with a relative error of 0.1％ or less. Finally, we applied the improved Moser method to forward modeling calculation of Marmousi2 model. The resulted ray map agreed with the theoretical expectation, which proved the accuracy of improved Moser method. |
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