Pn wave velocity structure and anisotropy in the central Tien Shan region
文献类型：期刊论文
| 作者 | Li Zhi-Wei; Xu Yi; Roecker, Steven W.; Hao Tian-Yao; Liu Jin-Song |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2007-07-01 |
| 卷号 | 50期号:4页码:1066-1072 |
| 关键词 | central Tien Shan uppermost mantle Pn velocity anisotropy |
| ISSN号 | 0001-5733 |
| 文献子类 | Article |
| 英文摘要 | Pn wave velocity structure and anisotropy in the central Tien Shan are investigated by using seismic arrival data from the temporary broadband network (GHENGIS) and the Kyrgyzstan seismic network (KNET) The results reveal lower average Pn velocities and strong heterogeneity at the uppermost mantle beneath the central Tien Shan, which are often found in tectonically active zones. Particularly, very low Pn velocities are found in the south-central Tien Shan, which is believed to be underlain by an unusual mantle with higher heat flows. There is a clear correlation between seismic activity and Pn velocity variation. Most earthquakes are concentrated in the north-central Tien Shan with high Pit velocities, while almost no earthquakes located in the south-central Tien Shan with very low Pn velocities. Our result suggests that the very low Pn velocity beneath the south-central Tien Shan is caused by high temperatures produced by heating from mantle upwelling, and that this heat has been conducted up into the crust, inducing a ductile theology that prevents significant seismic activity. Moreover, strong anisotropy is observed in the north- and south-central Tien Shan. Fast Pn velocity in the south-central Tien Shan is nearly in N-S directions, which is consistent with the SKS wave anisotropy concerning mantle flow. However, fast Pn velocity directions in the north-central Tien Shan show a southward rotation variation. We estimate that it is probably related to the inserting of the crust of the Chu basin from the southern Kazakhstan platform to the central Tien Shan, which caused a change of stress fields and lithosphere deformation. |
| WOS关键词 | RECEIVER FUNCTIONS ; CENTRAL-ASIA ; SOURCE PARAMETERS ; EARTHQUAKE ; KYRGYZSTAN ; INVERSION ; ASTHENOSPHERE ; LITHOSPHERE ; TOMOGRAPHY ; WESTERN |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000248343500013 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/67278]  |
| 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 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Rensselaer Polytech Inst, Troy, NY 12180 USA |
| 推荐引用方式 GB/T 7714 | Li Zhi-Wei,Xu Yi,Roecker, Steven W.,et al. Pn wave velocity structure and anisotropy in the central Tien Shan region[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2007,50(4):1066-1072. |
| APA | Li Zhi-Wei,Xu Yi,Roecker, Steven W.,Hao Tian-Yao,&Liu Jin-Song.(2007).Pn wave velocity structure and anisotropy in the central Tien Shan region.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,50(4),1066-1072. |
| MLA | Li Zhi-Wei,et al."Pn wave velocity structure and anisotropy in the central Tien Shan region".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 50.4(2007):1066-1072. |
入库方式： OAI收割
来源：地质与地球物理研究所
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