| 三维复杂层状介质中多震相走时联合反演成像 |
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| 引用本文： | 白超英,黄国娇,李忠生.三维复杂层状介质中多震相走时联合反演成像[J].地球物理学报,2011,54(1):182-192. |
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| 作者姓名： | 白超英 黄国娇 李忠生 |
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| 作者单位： | 1. 长安大学地质工程与测绘学院地球物理系,西安 710054;
2. 长安大学计算地球物理研究所,西安 710054 |
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| 基金项目： | 国家自然科学基金项目，国家深部探测技术与试验研究子专题 |
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| 摘 要： | 采用新近提出的改进型不规则最短路径多次波射线追踪正演技术,结合共轭梯度法求解带约束的阻尼最小二乘最优化反演问题,讨论了三维复杂层状模型中利用多震相走时资料进行联合反演成像的技术方法.考虑到不同震相种类走时的拾取误差不同,反演算法中引入了不同震相种类数据的权系数;另外,考虑到同时反演速度模型和反射界面起伏中不同参数变化对...
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| 关 键 词： | 改进型小规则最短路径 多次波射线追踪 多震相走时 联合反演 同时反演 地震层析成像 |
| 收稿时间： | 2010-10-08 |
Simultaneous inversion combining multiple-phase travel times within 3D complex layered media |
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| BAI Chao-Ying,HUANG Guo-Jiao,LI Zhong-Sheng.Simultaneous inversion combining multiple-phase travel times within 3D complex layered media[J].Chinese Journal of Geophysics,2011,54(1):182-192. |
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| Authors: | BAI Chao-Ying HUANG Guo-Jiao LI Zhong-Sheng |
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| Institution: | 1. Department of Geophysics, College of Geology Engineering and Geomatics, Chang'an University, Xi'an 710054, China;
2. Institute of Computing Geophysics, Chang'an University, Xi'an 710054, China |
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| Abstract: | By exploring a newly developed multiple (reflected, transmitted and converted) arrival tracking algorithm with modified irregular shortest-path method, and combining the conjugated gradient method to solve the constrained, damped least square problem, we discuss and analyze a simultaneous inversion algorithm combining different travel time datasets in 3D complex layered media. In the inversion process we introduce different weighting factors according to the different picking errors of different sets of arrival times. In order to balance the influence on the two different model parameters in simultaneous inversion, we normalize two different model parameters in Jacobi matrix in the inversion process. The numerical results show that it is a practical and efficient way to improve the spatial resolution and reduce the artifact in reconstructing velocity distribution and reflected subsurface interface. |
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| Keywords: | Modified irregular shortest-path method Multiple arrival tracking Multi-phase travel times Joint inversion Simultaneous inversion Seismic tomography |
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