Radial anisotropy in the crust and upper mantle beneath the Qinghai-Tibet Plateau and surrounding regions
文献类型：期刊论文
| 作者 | Chen, Yun1; Badal, Jose2; Zhang, Zhongjie1 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2009-10-18 |
| 卷号 | 36期号:4-5页码:289-302 |
| 关键词 | Surface waves Tomography Radial anisotropy Qinghai-Tibet Plateau |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2009.06.011 |
| 文献子类 | Article |
| 英文摘要 | Relative SV and SH wave speeds are generally attributed to radial seismic anisotropy which can be used as the indicator of crust/mantle deformation styles. Surface wave data were initially collected from events of magnitude Ms >= 5.0 and shallow or moderate focal depth occurring between 1980 and 2002: 713 of them generated Rayleigh waves and 660 Love waves, which were recorded by 13 broadband digital stations in Eurasia and India. Up to 1525 source-station Rayleigh waveforms and 1464 Love wave trains were earlier analysed by multiple filtering to obtain Love- and Rayleigh wave group velocity curves in the broad period range 10-105 s. We have performed tomographic inversion to obtain period-dependent group velocity and further shear wave velocity at 2 degrees x 2 degrees-sized grid-cells of a mesh covering the model region, after averaging azimuthal effects. Horizontally and vertically varying shear-wave velocities are observed, but the models of isotropic seismic velocity in the crust and upper mantle cannot fit simultaneously the inverted group-velocity dispersion curves due to the discrepancy in the transmission velocities of Love and Rayleigh waves, whose likely origin is the existence of radial anisotropy in the continental crust and topmost mantle. The strength of radial anisotropy computed from the Love-Rayleigh discrepancy and its spatial extent beneath the Qinghai-Tibet Plateau are shown as maps of percentage anisotropy at various depths down to 170 km and cross-sections along five profiles of reference. Areas in which radial anisotropy is in excess of similar to 6% are found in the crust and upper mantle underlying most of the plateau, and even up to 10% in some places. The strength and spatial configuration of radial anisotropy seem to indicate the existence of a regime of horizontal compressive forces in the frame of the convergent Himalayan-Tibetan orogen, the laterally variation of the lithospheric rheology and the differential movement as regards the compressive driving forces. (c) 2009 Elsevier Ltd. All rights reserved. |
| WOS关键词 | SURFACE-WAVE DISPERSION ; SEISMIC ANISOTROPY ; VELOCITY STRUCTURE ; IBERIAN PENINSULA ; FORM INVERSION ; ATLANTIC-OCEAN ; INDIAN-OCEAN ; TOMOGRAPHY ; RAYLEIGH ; LOVE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000270622500003 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Natural Science Foundation of China(40504012) ; National Natural Science Foundation of China(40504012) ; National Natural Science Foundation of China(40504012) ; National Natural Science Foundation of China(40504012) ; Ministry of Science and Technology of China(2002CB412604) ; Ministry of Science and Technology of China(2002CB412604) ; Ministry of Science and Technology of China(2002CB412604) ; Ministry of Science and Technology of China(2002CB412604) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China(40504012) ; National Natural Science Foundation of China(40504012) ; National Natural Science Foundation of China(40504012) ; National Natural Science Foundation of China(40504012) ; Ministry of Science and Technology of China(2002CB412604) ; Ministry of Science and Technology of China(2002CB412604) ; Ministry of Science and Technology of China(2002CB412604) ; Ministry of Science and Technology of China(2002CB412604) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China(40504012) ; National Natural Science Foundation of China(40504012) ; National Natural Science Foundation of China(40504012) ; National Natural Science Foundation of China(40504012) ; Ministry of Science and Technology of China(2002CB412604) ; Ministry of Science and Technology of China(2002CB412604) ; Ministry of Science and Technology of China(2002CB412604) ; Ministry of Science and Technology of China(2002CB412604) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China(40504012) ; National Natural Science Foundation of China(40504012) ; National Natural Science Foundation of China(40504012) ; National Natural Science Foundation of China(40504012) ; Ministry of Science and Technology of China(2002CB412604) ; Ministry of Science and Technology of China(2002CB412604) ; Ministry of Science and Technology of China(2002CB412604) ; Ministry of Science and Technology of China(2002CB412604) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/71483]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Chen, Yun |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Zaragoza, Sci B, E-50009 Zaragoza, Spain |
| 推荐引用方式 GB/T 7714 | Chen, Yun,Badal, Jose,Zhang, Zhongjie. Radial anisotropy in the crust and upper mantle beneath the Qinghai-Tibet Plateau and surrounding regions[J]. JOURNAL OF ASIAN EARTH SCIENCES,2009,36(4-5):289-302. |
| APA | Chen, Yun,Badal, Jose,&Zhang, Zhongjie.(2009).Radial anisotropy in the crust and upper mantle beneath the Qinghai-Tibet Plateau and surrounding regions.JOURNAL OF ASIAN EARTH SCIENCES,36(4-5),289-302. |
| MLA | Chen, Yun,et al."Radial anisotropy in the crust and upper mantle beneath the Qinghai-Tibet Plateau and surrounding regions".JOURNAL OF ASIAN EARTH SCIENCES 36.4-5(2009):289-302. |
入库方式： OAI收割
来源：地质与地球物理研究所
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