The factored eikonal equation in curvilinear coordinate system and its numerical solution
文献类型：期刊论文
| 作者 | Zhou XiaoLe1,3; Lan HaiQiang1,3; Chen Ling1,2,3; Guo GaoShan1,3 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2020-02-01 |
| 卷号 | 63期号:2页码:638-651 |
| 关键词 | Curvilinear coordinate system Factorization Eikonal equation Source singularity |
| ISSN号 | 0001-5733 |
| DOI | 10.6038/cjg2020N0185 |
| 英文摘要 | The calculation of first-arrival traveltime plays an important role in many areas of seismology such as static correction, seismic tomography, pre-stack migration, earthquake location, etc. Complex surface conditions are important factors affecting the accuracy of traveltime calculation. In recent years, the development of eikonal equation in a curvilinear coordinate system paves a new way for calculating seismic traveltime with an irregular surface. However, the finite-difference-based eikonal solution is inevitably affected by the source singularity. Due to the high curvature of the wavefront around the source, using a plane wave to approximate the wavefront results in a large numerical error, which will propagate from the source to all computational domain. In order to solve this problem, we formulate the factored eikonal equation in the curvilinear coordinate system using factorization. Then, we develop a factored fast sweeping solver to address the source singularity problem for traveltime calculation with an irregular surface. Numerical examples show that the factored sweeping method can treat the source singularity successfully, improve the accuracy and efficiency of the traveltime calculation with an irregular surface significantly. It provides a better choice for the traveltime calculation with an irregular surface, showing a wide potential in the seismic data processing under complex topographical conditions. |
| WOS关键词 | 1ST-ARRIVAL TRAVEL-TIMES ; FAST SWEEPING METHOD ; FINITE-DIFFERENCE COMPUTATION ; WAVE VELOCITY STRUCTURE ; UPPER-MANTLE BENEATH ; FREE-SURFACE ; COMPLEX 2D ; P-WAVE ; TOMOGRAPHY ; MEDIA |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000512885500022 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/95642]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Lan HaiQiang |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou XiaoLe,Lan HaiQiang,Chen Ling,et al. The factored eikonal equation in curvilinear coordinate system and its numerical solution[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2020,63(2):638-651. |
| APA | Zhou XiaoLe,Lan HaiQiang,Chen Ling,&Guo GaoShan.(2020).The factored eikonal equation in curvilinear coordinate system and its numerical solution.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,63(2),638-651. |
| MLA | Zhou XiaoLe,et al."The factored eikonal equation in curvilinear coordinate system and its numerical solution".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 63.2(2020):638-651. |
入库方式： OAI收割
来源：地质与地球物理研究所
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