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Two-Staged Rupture of the 19 October 2020 M-w 7.6 Strike-Slip Earthquake Illuminated the Boundary of Coupling Variation in the Shumagin Islands, Alaska

文献类型：期刊论文

作者Wan, Zhifan3; Wang, Dun3; Zhang, Junfeng2; Li, Qi1; Zhao, Lianfeng4; Cheng, Yifang6; Mori, Jim5; Chen, Fang3; Peng, Yuyang3
刊名SEISMOLOGICAL RESEARCH LETTERS
出版日期2023
卷号94期号:1页码:52-65
ISSN号0895-0695
DOI10.1785/0220220203
英文摘要On 19 October 2020, an Mw 7.6 earthquake occurred within the Shumagin Islands, Alaska, which is the largest strike-slip earthquake occurred in the shallow subducted plates with abundant seismic observations. Here, we relocated the earthquake sequence, imple-mented back-projection analyses, and finite-fault inversion to investigate the source processes of the mainshock, and calculated mainshock focal mechanisms using the polar-ities of P waves and W-phase inversion, respectively. Our results show that the faulting of the mainshock can be divided into two segments with the initial rupture along a steep plane (strike = 15 degrees, dip = 81 degrees) and propagation southeastward along a more shallowly dipping plane (strike = 344 degrees, dip = 48 degrees). The inferred strikes of the mainshock faults are similar to the orientations of preexisting structures in the source region, likely indicating that the 2020 Mw 7.6 earthquake ruptured along the preexisting plate fabric in the down -going plate. The fabrics are located at the boundary with significant variations of the plate coupling, indicating that these structures within the subducting plate may affect the interplate coupling or as a result of the varying interplate coupling in subduction zones.
WOS关键词SUBDUCTION ZONE ; INTRAPLATE EARTHQUAKES ; WENCHUAN EARTHQUAKE ; GREAT EARTHQUAKES ; HIGH-FREQUENCY ; FAULT ; LOCATION ; CHINA ; BACKPROJECTION ; PENINSULA
资助项目National Key R&D Program of China[2018YFC0603500] ; National Natural Science Foundation of China (NSFC)[41874062] ; National Natural Science Foundation of China (NSFC)[41922025]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者SEISMOLOGICAL SOC AMER
WOS记录号WOS:000907165300001
资助机构National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC)
源URL[http://ir.iggcas.ac.cn/handle/132A11/106900]  
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Wang, Dun
作者单位1.China Earthquake Adm, Inst Seismol, Key Lab Earthquake Geodesy, Wuhan, Peoples R China
2.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan, Peoples R China
3.China Univ Geosci, Sch Earth Sci, Badong Natl Observat & Res Stn Geohazards, Wuhan, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
5.Kyoto Univ, Disaster Prevent Res Inst, Uji, Japan
6.Univ Southern Calif, Dept Earth Sci, Los Angeles, CA USA
推荐引用方式
GB/T 7714		 Wan, Zhifan,Wang, Dun,Zhang, Junfeng,et al. Two-Staged Rupture of the 19 October 2020 M-w 7.6 Strike-Slip Earthquake Illuminated the Boundary of Coupling Variation in the Shumagin Islands, Alaska[J]. SEISMOLOGICAL RESEARCH LETTERS,2023,94(1):52-65.
APA Wan, Zhifan.,Wang, Dun.,Zhang, Junfeng.,Li, Qi.,Zhao, Lianfeng.,...&Peng, Yuyang.(2023).Two-Staged Rupture of the 19 October 2020 M-w 7.6 Strike-Slip Earthquake Illuminated the Boundary of Coupling Variation in the Shumagin Islands, Alaska.SEISMOLOGICAL RESEARCH LETTERS,94(1),52-65.
MLA Wan, Zhifan,et al."Two-Staged Rupture of the 19 October 2020 M-w 7.6 Strike-Slip Earthquake Illuminated the Boundary of Coupling Variation in the Shumagin Islands, Alaska".SEISMOLOGICAL RESEARCH LETTERS 94.1(2023):52-65.

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来源：地质与地球物理研究所

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