IGGCAS OpenIR  > 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
Chen, JunLei1,2,3; Hao, JinLai4; Wang, Zun4; Xu, Tao1,5
2022-05-01
Source PublicationSEISMOLOGICAL RESEARCH LETTERS
ISSN0895-0695
Volume93Issue:3Pages:1382-1399
AbstractAn 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.
DOI10.1785/0220210241
Funding OrganizationSecond 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
WOS Keyword1999 HECTOR MINE ; CRUSTAL VELOCITY ; STRONG-MOTION ; FAULT ; HISTORY ; CALIFORNIA ; INVERSION ; STRESS
Language英语
Funding ProjectSecond 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]
Funding OrganizationSecond 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
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000792383000002
PublisherSEISMOLOGICAL SOC AMER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105903
Collection岩石圈演化国家重点实验室
地球与行星物理院重点实验室
Corresponding AuthorHao, JinLai
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.China Earthquake Adm, Yunnan Earthquake Agcy, Kunming, Yunnan, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Earth & Planetary Phys, Beijing, Peoples R China
5.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Chen, JunLei]'s Articles
[Hao, JinLai]'s Articles
[Wang, Zun]'s Articles
Baidu academic
Similar articles in Baidu academic
[Chen, JunLei]'s Articles
[Hao, JinLai]'s Articles
[Wang, Zun]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Chen, JunLei]'s Articles
[Hao, JinLai]'s Articles
[Wang, Zun]'s Articles
Terms of Use
No data!
Social Bookmark/Share
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit Add to Technorati
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.