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Seismic Anisotropy and Mantle Flow Constrained by Shear Wave Splitting in Central Myanmar

文献类型：期刊论文

作者Fan, Enbo3,4,5; He, Yumei1,3,5; Ai, Yinshuang1,3,5; Gao, Stephen S.4; Liu, Kelly H.4; Jiang, Mingming1,3,5; Hou, Guangbing5; Mon, Chit Thet2,5; Thant, Myo7; Sein, Kyaing6
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2021-10-01
卷号126期号:10页码:15
ISSN号2169-9313
关键词seismic anisotropy mantle flow shear wave splitting central Myanmar oblique subduction
DOI10.1029/2021JB022144
英文摘要This study represents the first campaign-style teleseismic shear wave splitting (SWS) investigation of central Myanmar, an area that is tectonically controlled by the oblique subduction of the Indian Plate underneath the Eurasian Plate. The resulting 678 well-defined and 247 null SWS measurements obtained from recently deployed 71 broadband seismic stations show that the Indo-Burma Ranges (IBR) possess mostly N-S fast orientations that are parallel to the trend of the depth contours of the subducted slab. Relative to the global average of 1.0 s, extremely large splitting times with station-averaged values ranging from 1.28 to 2.79 s and an area-averaged value of 2.09 +/- 0.55 s are observed in the IBR. In contrast, the Central Basin (CB) and the Shan Plateau (SP) are characterized by slightly larger than normal splitting times. The fast orientations observed in the CB are mostly NE-SW in the northern part of the study area, N-S in the central part, and NW-SE in the southern part. The fast orientations change from nearly N-S along the N-S oriented Sagaing Fault, to NW-SE in the central and eastern portions of the SP. These observations, together with SWS measurements using local S events, crustal anisotropy measurements using P-to-S receiver functions, and the estimated depth of the source of anisotropy using the spatial coherency of the splitting parameters, suggest the presence of a trench-parallel sub-slab flow system driven by slab rollback, a trench-perpendicular corner flow, and a trench-parallel flow possibly entering the mantle wedge through a slab window or gap.
WOS关键词TIBETAN PLATEAU ; BENEATH ; SUBDUCTION ; TECTONICS ; SLAB ; POLARIZATIONS ; LITHOSPHERE ; INSIGHTS ; FAULT ; CRUST
资助项目National Natural Science Foundation of China[91755214] ; National Natural Science Foundation of China[42030309] ; National Natural Science Foundation of China[41490612] ; University of Chinese Academy of Sciences (UCAS) ; United States National Science Foundation[1830644] ; United States National Science Foundation[1919789]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者AMER GEOPHYSICAL UNION
WOS记录号WOS:000711968800064
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; University of Chinese Academy of Sciences (UCAS) ; University of Chinese Academy of Sciences (UCAS) ; University of Chinese Academy of Sciences (UCAS) ; University of Chinese Academy of Sciences (UCAS) ; United States National Science Foundation ; United States National Science Foundation ; United States National Science Foundation ; United States National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; University of Chinese Academy of Sciences (UCAS) ; University of Chinese Academy of Sciences (UCAS) ; University of Chinese Academy of Sciences (UCAS) ; University of Chinese Academy of Sciences (UCAS) ; United States National Science Foundation ; United States National Science Foundation ; United States National Science Foundation ; United States National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; University of Chinese Academy of Sciences (UCAS) ; University of Chinese Academy of Sciences (UCAS) ; University of Chinese Academy of Sciences (UCAS) ; University of Chinese Academy of Sciences (UCAS) ; United States National Science Foundation ; United States National Science Foundation ; United States National Science Foundation ; United States National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; University of Chinese Academy of Sciences (UCAS) ; University of Chinese Academy of Sciences (UCAS) ; University of Chinese Academy of Sciences (UCAS) ; University of Chinese Academy of Sciences (UCAS) ; United States National Science Foundation ; United States National Science Foundation ; United States National Science Foundation ; United States National Science Foundation
源URL[http://ir.iggcas.ac.cn/handle/132A11/103794]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Ai, Yinshuang; Gao, Stephen S.
作者单位1.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
2.Dagon Univ, Dept Geol, Yangon, Myanmar
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
4.Missouri Univ Sci & Technol, Geol & Geophys Program, Rolla, MO 65409 USA
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
6.Myanmar Geosci Soc, Yangon, Myanmar
7.Univ Yangon, Dept Geol, Yangon, Myanmar
推荐引用方式
GB/T 7714		 Fan, Enbo,He, Yumei,Ai, Yinshuang,et al. Seismic Anisotropy and Mantle Flow Constrained by Shear Wave Splitting in Central Myanmar[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2021,126(10):15.
APA Fan, Enbo.,He, Yumei.,Ai, Yinshuang.,Gao, Stephen S..,Liu, Kelly H..,...&Sein, Kyaing.(2021).Seismic Anisotropy and Mantle Flow Constrained by Shear Wave Splitting in Central Myanmar.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,126(10),15.
MLA Fan, Enbo,et al."Seismic Anisotropy and Mantle Flow Constrained by Shear Wave Splitting in Central Myanmar".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 126.10(2021):15.

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来源：地质与地球物理研究所

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