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  4. 岩石圈演化国家重点实验室
The 21 May 2021 M-w 6.1 Yangbi Earthquake-A Unilateral Rupture Event with Conjugately Distributed Aftershocks

文献类型：期刊论文

作者Chen, JunLei1,2,5; Hao, JinLai4; Wang, Zun4; Xu, Tao1,3
刊名SEISMOLOGICAL RESEARCH LETTERS
出版日期2022-05-01
卷号93期号:3页码:1382-1399
ISSN号0895-0695
DOI10.1785/0220210241
英文摘要An M-w 6.1 earthquake occurred in Yangbi, Yunnan province, China, at 13:48:34 (UTC time) on 21 May 2021. It exhibited a typical foreshock-mainshock-aftershock sequence in the northwestern Yunnan rifting area. We used the first P-arrival time from regional broadband seismic stations to check the location of the mainshock's hypocenter. The updated location of the epicenter is 99.88 degrees E, 25.66 degrees N. The focal mechanisms of nine earthquakes, including the mainshock and the largest foreshock and aftershock, were investigated using the general cut-and-paste method based on regional seismic waveforms to set up the fault geometry and to calculate the static coulomb stress change. The rupture process of the mainshock was constrained by 33 unclipped regional broadband seismic records from 15 stations and nine static displacements from three Global Navigation Satellite System stations. The results showed that the Yangbi earthquake was a unilateral rupture event propagating toward the southeast along-strike direction. The moment was 1.81 x 10(18) N.m, and the corresponding magnitude was M-w 6.1. The peak slip value, the weighted rupture velocity, and the duration time of the mainshock were 0.95 m, 2.2 km/s, and 9.1 s, respectively. At 10 km southeast of the mainshock's epicenter, the conjugately distributed aftershocks were observed, and the moment density of the mainshock along the strike direction decreased sharply (78% of the total moment released in the first 10 km), suggesting that the sharply decelerating rupture could be the reason for the conjugately distributed aftershocks. The changes in static coulomb stress due to the largest foreshock and mainshock were calculated. The results showed positive Coulomb stress on the major slip zone in the mainshock fault plane triggered by the largest foreshock. Moreover, the 0.01 MPa contour due to the mainshock radiated out of the bend zone of the Weixi-Qiaohou-Weishan fault.
WOS关键词1999 HECTOR MINE ; CRUSTAL VELOCITY ; STRONG-MOTION ; FAULT ; HISTORY ; CALIFORNIA ; INVERSION ; STRESS
资助项目Second Tibetan Plateau Scientific Expedition and Research Program STEP[2019QZKK0701] ; National Science Foundation of China[42074066] ; National Science Foundation of China[41574058] ; National Science Foundation of China[42130807] ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences[IGGCAS-201904] ; Science and Technology Project of Yunnan Earthquake Agency[2021YBZX15] ; Science and Technology Project of Yunnan Earthquake Agency[2020ZX01]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000792383000002
出版者SEISMOLOGICAL SOC AMER
资助机构Second Tibetan Plateau Scientific Expedition and Research Program STEP ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Science and Technology Project of Yunnan Earthquake Agency ; Science and Technology Project of Yunnan Earthquake Agency ; Science and Technology Project of Yunnan Earthquake Agency ; Science and Technology Project of Yunnan Earthquake Agency ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Science and Technology Project of Yunnan Earthquake Agency ; Science and Technology Project of Yunnan Earthquake Agency ; Science and Technology Project of Yunnan Earthquake Agency ; Science and Technology Project of Yunnan Earthquake Agency ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Science and Technology Project of Yunnan Earthquake Agency ; Science and Technology Project of Yunnan Earthquake Agency ; Science and Technology Project of Yunnan Earthquake Agency ; Science and Technology Project of Yunnan Earthquake Agency ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; Second Tibetan Plateau Scientific Expedition and Research Program STEP ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Science and Technology Project of Yunnan Earthquake Agency ; Science and Technology Project of Yunnan Earthquake Agency ; Science and Technology Project of Yunnan Earthquake Agency ; Science and Technology Project of Yunnan Earthquake Agency
源URL[http://ir.iggcas.ac.cn/handle/132A11/105903]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
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Hao, JinLai
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.China Earthquake Adm, Yunnan Earthquake Agcy, Kunming, Yunnan, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Earth & Planetary Phys, Beijing, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Chen, JunLei,Hao, JinLai,Wang, Zun,et al. The 21 May 2021 M-w 6.1 Yangbi Earthquake-A Unilateral Rupture Event with Conjugately Distributed Aftershocks[J]. SEISMOLOGICAL RESEARCH LETTERS,2022,93(3):1382-1399.
APA Chen, JunLei,Hao, JinLai,Wang, Zun,&Xu, Tao.(2022).The 21 May 2021 M-w 6.1 Yangbi Earthquake-A Unilateral Rupture Event with Conjugately Distributed Aftershocks.SEISMOLOGICAL RESEARCH LETTERS,93(3),1382-1399.
MLA Chen, JunLei,et al."The 21 May 2021 M-w 6.1 Yangbi Earthquake-A Unilateral Rupture Event with Conjugately Distributed Aftershocks".SEISMOLOGICAL RESEARCH LETTERS 93.3(2022):1382-1399.

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来源：地质与地球物理研究所

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