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Azimuthal anisotropy and mantle flow underneath the southeastern Tibetan Plateau and northern Indochina Peninsula revealed by shear wave splitting analyses
Kong, Fansheng1,2; Wu, Jing3; Liu, Lin2; Liu, Kelly H.2; Song, Jianguo4; Li, Jiabiao1; Gao, Stephen S.2
2018-11-13
发表期刊TECTONOPHYSICS
ISSN0040-1951
卷号747页码:68-78
摘要Seismic azimuthal anisotropy beneath the transitional region between the southeastern Tibetan Plateau and the Indochina Peninsula, an area in which the fast orientation of mantle anisotropy changes to dominantly E-W from mostly N-S on the plateau at the north, is quantified using splitting of the SKS, SKKS, and PIGS phases. Among the 50 stations with one or more splitting measurements, 22 possess an azimuthal coverage that is adequate for the identification and characterization of complex anisotropy. The resulting splitting parameters from 15 such stations exhibit systematic back azimuthal variations with a 90 degrees periodicity, which is consistent with a two-layered anisotropy model. The upper layer parameters are consistent with crustal anisotropy measurements obtained independently based on the sinusoidal moveout of P-to-S conversions from the Moho, with the fast orientations being mostly parallel to major shear zones. The lower layer fast orientations and the fast orientations at stations with azimuthally invariant splitting parameters are mostly E-W, which is significantly different from the dominantly N-S trend of the surface expression of major structural fabrics in the area. They are also inconsistent with the absolute plate motion directions. When combined with results from seismic tomography and focal mechanism solutions, the observed azimuthal anisotropy can be adequately explained by the movement of the lithosphere relative to the underlain asthenosphere, most likely associated with the westward rollback of the subducted Indian Plate.
关键词Seismic anisotropy Southeastern Tibetan Plateau Slab rollback Shear wave splitting
DOI10.1016/j.tecto.2018.09.013
资助者Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; United States National Science Foundation ; United States National Science Foundation ; Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; United States National Science Foundation ; United States National Science Foundation ; Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; United States National Science Foundation ; United States National Science Foundation ; Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; United States National Science Foundation ; United States National Science Foundation
关键词[WOS]LOWER CRUSTAL FLOW ; SEISMIC ANISOTROPY ; GEODYNAMIC IMPLICATIONS ; CONTINENTAL EXTRUSION ; SURFACE DEFORMATION ; DYNAMICS BENEATH ; CENTRAL-ASIA ; SUBDUCTION ; INSIGHT ; TOMOGRAPHY
语种英语
资助项目Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China[HYGG1802] ; United States National Science Foundation[EAR-0911346] ; United States National Science Foundation[EAR-1321656] ; United States National Science Foundation[EAR-1830644]
资助者Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; United States National Science Foundation ; United States National Science Foundation ; Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; United States National Science Foundation ; United States National Science Foundation ; Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; United States National Science Foundation ; United States National Science Foundation ; Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; Scientific Research Fund of the Second Institute of Oceanography State Oceanic Administration of China ; United States National Science Foundation ; United States National Science Foundation
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000453618800005
出版者ELSEVIER SCIENCE BV
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/90267
专题岩石圈演化国家重点实验室
通讯作者Gao, Stephen S.
作者单位1.State Ocean Adm, Inst Oceanog 2, Key Lab Submarine Geosci, Hangzhou 310012, Zhejiang, Peoples R China
2.Missouri Univ Sci & Technol, Geol & Geophys Program, Rolla, MO 65409 USA
3.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
4.China Univ Petr East China, Sch Geosci, Qingdao 266580, Peoples R China
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GB/T 7714
Kong, Fansheng,Wu, Jing,Liu, Lin,et al. Azimuthal anisotropy and mantle flow underneath the southeastern Tibetan Plateau and northern Indochina Peninsula revealed by shear wave splitting analyses[J]. TECTONOPHYSICS,2018,747:68-78.
APA Kong, Fansheng.,Wu, Jing.,Liu, Lin.,Liu, Kelly H..,Song, Jianguo.,...&Gao, Stephen S..(2018).Azimuthal anisotropy and mantle flow underneath the southeastern Tibetan Plateau and northern Indochina Peninsula revealed by shear wave splitting analyses.TECTONOPHYSICS,747,68-78.
MLA Kong, Fansheng,et al."Azimuthal anisotropy and mantle flow underneath the southeastern Tibetan Plateau and northern Indochina Peninsula revealed by shear wave splitting analyses".TECTONOPHYSICS 747(2018):68-78.
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