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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 | |
| Wan, Zhifan1; Wang, Dun1; Zhang, Junfeng2; Li, Qi3; Zhao, Lianfeng4; Cheng, Yifang5; Mori, Jim6; Chen, Fang1; Peng, Yuyang1 | |
| 2023 | |
| Source Publication | SEISMOLOGICAL RESEARCH LETTERS
 |
| ISSN | 0895-0695 |
| Volume | 94Issue:1Pages:52-65 |
| Abstract | 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. |
| DOI | 10.1785/0220220203 |
| Funding Organization | 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) |
| WOS Keyword | SUBDUCTION ZONE ; INTRAPLATE EARTHQUAKES ; WENCHUAN EARTHQUAKE ; GREAT EARTHQUAKES ; HIGH-FREQUENCY ; FAULT ; LOCATION ; CHINA ; BACKPROJECTION ; PENINSULA |
| Language | 英语 |
| Funding Project | National Key R&D Program of China[2018YFC0603500] ; National Natural Science Foundation of China (NSFC)[41874062] ; National Natural Science Foundation of China (NSFC)[41922025] |
| Funding Organization | 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) |
| WOS Research Area | Geochemistry & Geophysics |
| WOS Subject | Geochemistry & Geophysics |
| WOS ID | WOS:000907165300001 |
| Publisher | SEISMOLOGICAL SOC AMER |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.iggcas.ac.cn/handle/132A11/106900 |
| Collection | 地球与行星物理院重点实验室 |
| Corresponding Author | Wang, Dun |
| Affiliation | 1.China Univ Geosci, Sch Earth Sci, Badong Natl Observat & Res Stn Geohazards, Wuhan, Peoples R China 2.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan, Peoples R China 3.China Earthquake Adm, Inst Seismol, Key Lab Earthquake Geodesy, Wuhan, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China 5.Univ Southern Calif, Dept Earth Sci, Los Angeles, CA USA 6.Kyoto Univ, Disaster Prevent Res Inst, Uji, Japan |
| Recommended Citation 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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