Pn wave velocity and anisotropy in the northeastern South China Sea and adjacent region
文献类型：期刊论文
| 作者 | Xu Yi; Li Zhi-Wei; Hao Tian-Yao; Lu Jian-Hua; Liu Jin-Song |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2007-09-01 |
| 卷号 | 50期号:5页码:1473-1479 |
| 关键词 | northeastern South China Sea Pn wave velocity anisotropy lithosphere mantle |
| ISSN号 | 0001-5733 |
| 文献子类 | Article |
| 英文摘要 | Using seismic data from Chinese and ISC stations between 1980 similar to 2004, we inverted Pn wave velocity and anisotropy of the northeastern South China Sea and adjacent region. The velocity variations at uppermost mantle reflect the features of regional geology and tectonics. The southeastern China region has fast velocities correspondent to the lithospheric mantle in tectonically stable regions. Slow velocities appear near the Binhai fault zone along the coast of southeastern China,which indicates a possible penetration of the fault zone into the uppermost mantle. Similar to southeastern China, fast velocities throughout the northern South China Sea and Taiwan Strait reveal a property of the continental lithospheric mantle, while fast velocities in the Xisha Trough reflect a southward extension of continental margin and a mantle upwarp produced by rifting. There is no evidence showing large-scale mantle heat flows in the northem South China Sea. However, pronounced slow velocities are observed in the eastern sub-basin of the South China Sea, which is thought to be an extinct mantle upwelling center with high heat flows, indicating a thinning or removal of lithospheric mantle. Along the eastern Taiwan, Luzon and northern Philippine, slow velocities are related to seismic and volcanic activity and magmatism in the arc zone, while fast velocities in the eastern South China Sea and western Philippine Sea reflect the oceanic lithospheric mantle. Pn velocity anisotropy also reveals the stress state in regional tectonics and the history of deformation of lithospheric mantle. Southeastern China has small anisotropy in response to less deformation there. Clear anisotropy is observed in the northern South China Sea, with fast directions of anisotropy aligned with shallow structures, which reflect the evidence of the Mesozoic-Cenozoic rifting and shear deformation in the lithospheric mantle. Strong anisotropy is also observed along the Ryukyu-Taiwan-Luzon are zone and the fast directions parallel to those trenches indicate intense deformation in the lithospheric mantle of the leading edge of the Philippine Sea plate and Eurasian continent. The change of fast directions of anisotropy near eastern Taiwan is probably caused by a conversion of collision mechanisms between the Eurasian continent and the Philippine Sea plate,and the tear of the lithosphere mantle. |
| WOS关键词 | UPPER-MANTLE BENEATH ; CRUSTAL STRUCTURE ; PHILIPPINE SEA ; EASTERN CHINA ; HEAT-FLOW ; TOMOGRAPHY ; MARGIN ; TECTONICS ; PROFILE ; TAIWAN |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000249679300023 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/67888]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Xu Yi |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu Yi,Li Zhi-Wei,Hao Tian-Yao,et al. Pn wave velocity and anisotropy in the northeastern South China Sea and adjacent region[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2007,50(5):1473-1479. |
| APA | Xu Yi,Li Zhi-Wei,Hao Tian-Yao,Lu Jian-Hua,&Liu Jin-Song.(2007).Pn wave velocity and anisotropy in the northeastern South China Sea and adjacent region.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,50(5),1473-1479. |
| MLA | Xu Yi,et al."Pn wave velocity and anisotropy in the northeastern South China Sea and adjacent region".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 50.5(2007):1473-1479. |
入库方式： OAI收割
来源：地质与地球物理研究所
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