An iterative factored topography-dependent eikonal solver for anisotropic media
文献类型：期刊论文
| 作者 | Zhou, Xiaole4,5; Lan, Haiqiang4,5; Chen, Ling1,4,5; Guo, Gaoshan4,5; Lei, Yiming4,5; Bin Waheed, Umair3; Pan, Shulin2 |
| 刊名 | GEOPHYSICS
 |
| 出版日期 | 2021-09-01 |
| 卷号 | 86期号:5页码:U121-U134 |
| ISSN号 | 0016-8033 |
| DOI | 10.1190/GEO2020-0662.1 |
| 英文摘要 | Accurate and efficient eikonal solvers for heterogeneous media play an important role in many areas of seismology, such as seismic tomography, migration, and earthquake localization. Incorporating seismic anisotropy and complex topography remain a computational challenge for finite-difference eikonal solvers. In recent years, the topography-dependent eikonal equation (TDEE) has been proposed as an effective way to calculate seismic travel-times for isotropic and anisotropic media with irregular topography. However, the Lax-Friedrichs sweeping method used in previous studies to approximate the viscosity solution of TDEE for anisotropic media is more dissipative and needs a much higher number of iterations to converge. In addition, the TDEE solution for the initial point source has an upwind source singularity, which makes all TDEE solvers, even the high-order ones, exhibit polluted convergence and relatively large errors that propagate from the point source to the entire computational domain. To solve these problems, we have formulated the factored topography-dependent anisotropic eikonal (FTDAE) equation in tilted transversely isotropic (TTI) media using the factorization principle. Then, the resulting quartic equation can be numerically solved by using a fixed-point iteration technique based on the simpler elliptical anisotropic eikonal (EAE) equation with a high-order source term due to anelliptical anisotropy introduced by TTI media. At each iteration, the unknown traveltime in the EAE equation is factored into two functions: One of the functions is specified analytically to capture the source singularity, such that the unknown factor is differentiable in the source neighborhood and could be solved by the fast sweeping method. Numerical examples indicate that our FTDAE solver can treat source singularity successfully and achieve high accuracy after just a few iterations, independently of the mesh size, which could provide a more efficient and robust tool for traveltime calculation in the presence of seismic anisotropy and complex surfaces. |
| WOS关键词 | 1ST-ARRIVAL TRAVEL-TIMES ; TRANSVERSELY ISOTROPIC MEDIA ; FAST-SWEEPING SCHEME ; WAVE-FIELD SIMULATION ; P-WAVE ; EQUATION ; MIGRATION ; REFLECTION ; SURFACE ; APPROXIMATION |
| 资助项目 | National Natural Science Foundation of China[41674095] ; National Natural Science Foundation of China[41688103] ; Open Fund Project State Key Laboratory of Lithospheric Evolution[SKL-YT201802] ; Strategic Priority Research Program[XDA20070302] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000711980200047 |
| 出版者 | SOC EXPLORATION GEOPHYSICISTS |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Strategic Priority Research Program ; Strategic Priority Research Program ; Strategic Priority Research Program ; Strategic Priority Research Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Strategic Priority Research Program ; Strategic Priority Research Program ; Strategic Priority Research Program ; Strategic Priority Research Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Strategic Priority Research Program ; Strategic Priority Research Program ; Strategic Priority Research Program ; Strategic Priority Research Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Open Fund Project State Key Laboratory of Lithospheric Evolution ; Strategic Priority Research Program ; Strategic Priority Research Program ; Strategic Priority Research Program ; Strategic Priority Research Program |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/103792]  |
| 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 | Zhou, Xiaole |
| 作者单位 | 1.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 2.Southwest Petr Univ, Sch Geosci & Technol, Chengdu 610500, Peoples R China 3.King Fahd Univ Petr & Minerals, Coll Petr Engn & Geosci, Dhahran 31261, Saudi Arabia 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.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. An iterative factored topography-dependent eikonal solver for anisotropic media[J]. GEOPHYSICS,2021,86(5):U121-U134. |
| APA | Zhou, Xiaole.,Lan, Haiqiang.,Chen, Ling.,Guo, Gaoshan.,Lei, Yiming.,...&Pan, Shulin.(2021).An iterative factored topography-dependent eikonal solver for anisotropic media.GEOPHYSICS,86(5),U121-U134. |
| MLA | Zhou, Xiaole,et al."An iterative factored topography-dependent eikonal solver for anisotropic media".GEOPHYSICS 86.5(2021):U121-U134. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。