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  4. 中国科学院地球与行星物理重点实验室
New Insight into the Subducted Indian Plate beneath Central Myanmar Based on Seismic Activity and Focal Mechanisms Analysis

文献类型：期刊论文

作者Mon, Chit Thet2,6; Yang, Shun2,5; Ren, Changfeng2,5; He, Yumei2; Thant, Myo3,4; Sein, Kyaing1,4
刊名SEISMOLOGICAL RESEARCH LETTERS
出版日期2023-09-01
卷号94期号:5页码:2337-2347
ISSN号0895-0695
DOI10.1785/0220220381
英文摘要Myanmar is governed by the oblique subduction of India beneath the Burma microplate. Accurate earthquake location and focal mechanism data are crucial for understanding the detailed geometric features and dynamics of this subduction zone. We located 1433 subduction-related earthquakes and analyzed the focal mechanisms of 114 events using seismic data recorded by a recently deployed dense array in central Myanmar. The precisely located earthquakes show an east-dipping Wadati-Benioff zone beneath the Burma microplate at latitudes of 20.5 degrees-25.0 degrees N. In general, the subducting Indian plate imaged by seismicity has a dip angle of -18 degrees-25 degrees down to a depth of 80 km and then abruptly steepens to -33 degrees-45 degrees. The average thickness of the east-dipping seismic layer is-15 +/- 10 km in the shallow-intermediate depth range (10-80 km) and gradually becomes-21 +/- 10 km thick. By comparing the seismicity with the seismic velocity models revealed by receiver function and local tomography, intermediate-depth earthquakes appear to be mainly confined to the Indian lower continental crust at depths of 40-100 km. These earthquakes may be triggered by partial eclogitization reactions of the subducted lower continental crust. Stress inversion analysis of focal mechanism results grouped into 40-75, 75-90, and 90-130 km indicates that the principal compressional axes are essentially along the margin between the India and Burma microplate, implying resistance to the northward movement of the Indian plate. The principal tensional stress orients approximately east-west with its plunge systematically increasing with depth, implying the deformation may be caused by the negative buoyancy of the previously subducted oceanic slab.
WOS关键词BURMA ; TECTONICS ; GEOMETRY ; CONVERGENCE ; HIMALAYAN ; STRESS ; FAULT ; ASIA
资助项目Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; National Natural Science Foundation of China[42130308]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者SEISMOLOGICAL SOC AMER
WOS记录号WOS:001124723400001
资助机构Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; Chinese government scholarship, Institute of Geology and Geophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/111674]  
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Mon, Chit Thet
作者单位1.Myanmar Geosci Soc, Yangon, Myanmar
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
3.Myanmar Earthquake Comm, Yangon, Myanmar
4.Hlaing Univ Yangon, Dept Geol, Yangon, Myanmar
5.Univ Chinese Acad Sci, Beijing, Peoples R China
6.Dagon Univ, Dept Geol, Yangon, Myanmar
推荐引用方式
GB/T 7714		 Mon, Chit Thet,Yang, Shun,Ren, Changfeng,et al. New Insight into the Subducted Indian Plate beneath Central Myanmar Based on Seismic Activity and Focal Mechanisms Analysis[J]. SEISMOLOGICAL RESEARCH LETTERS,2023,94(5):2337-2347.
APA Mon, Chit Thet,Yang, Shun,Ren, Changfeng,He, Yumei,Thant, Myo,&Sein, Kyaing.(2023).New Insight into the Subducted Indian Plate beneath Central Myanmar Based on Seismic Activity and Focal Mechanisms Analysis.SEISMOLOGICAL RESEARCH LETTERS,94(5),2337-2347.
MLA Mon, Chit Thet,et al."New Insight into the Subducted Indian Plate beneath Central Myanmar Based on Seismic Activity and Focal Mechanisms Analysis".SEISMOLOGICAL RESEARCH LETTERS 94.5(2023):2337-2347.

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来源：地质与地球物理研究所

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