Seismic traveltime computation for transversely isotropic media
文献类型：期刊论文
| 作者 | Zhao Ai-Hua; Zhang Mei-Gen; Ding Zhi-Feng |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2006-11-01 |
| 卷号 | 49期号:6页码:1762-1769 |
| 关键词 | transversely isotropy group velocity traveltime minimum traveltime tree algorithm |
| ISSN号 | 0001-5733 |
| 文献子类 | Article |
| 英文摘要 | The minimum traveltime tree algorithm for tracing rays in isotropic media is extended to transversely isotropic (TI) media, which exist extensively in the Earth. The extended algorithm is suitable to heterogeneous TI media with tilted axes of symmetry. Construction of the minimum traveltime tree is implemented efficiently with a modified algorithm in which propagation areas of secondary waves are not fixed but adjusted dynamically with spread of seismic waves in media. As for weakly anisotropic media, we use a new approximate formula of group velocity in terms of ray angle. The approximate velocity formula is based on the expression of phase angle in terms of ray angle, and fits well the exact values for three independent modes of seismic waves (qP, qSV and qSH). Homogeneous and heterogeneous models are calculated with the extended minimum traveltime tree algorithm. We compare our results corresponding to the heterogeneous model with those obtained by a finite-element method for elastic anisotropic waves and find that they are in excellent agreement. The extended ray tracing method can be applied to further researches on depth migration and seismic tomography for TI media. |
| WOS关键词 | WEAKLY ANISOTROPIC MEDIA ; FINITE-DIFFERENCE CALCULATION ; VELOCITY ANALYSIS ; EIKONAL EQUATION ; ELASTIC-ANISOTROPY ; TREE ALGORITHM ; WAVES ; REFLECTION ; RAYS |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000242388600024 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/66690]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhao Ai-Hua |
| 作者单位 | 1.China Earthquake Adm, Inst Geophys, Beijing 100081, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao Ai-Hua,Zhang Mei-Gen,Ding Zhi-Feng. Seismic traveltime computation for transversely isotropic media[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2006,49(6):1762-1769. |
| APA | Zhao Ai-Hua,Zhang Mei-Gen,&Ding Zhi-Feng.(2006).Seismic traveltime computation for transversely isotropic media.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,49(6),1762-1769. |
| MLA | Zhao Ai-Hua,et al."Seismic traveltime computation for transversely isotropic media".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 49.6(2006):1762-1769. |
入库方式： OAI收割
来源：地质与地球物理研究所
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