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Temporary stress regime reversal immediately after the complete release of the localized compressive stress by the 2021 Luxian Ms 6.0 earthquake, Sichuan Basin

文献类型：期刊论文

作者Wang, Chaoliang5; Liang, Chuntao4,5; Liao, Jiangtao5; Yao, Zhenxing1,3; Xu, Rui5; Yang, Yihai2
刊名EARTH AND PLANETARY SCIENCE LETTERS
出版日期2023-09-15
卷号618页码:12
ISSN号0012-821X
关键词luxian earthquake seismogenic structure aftershocks localized stress concentration
DOI10.1016/j.epsl.2023.118282
英文摘要Aftershocks can provide fundamental information of the seismogenic structure and the stress condition of the source region to reveal the seismogenic mechanism of earthquakes without clear surface rupture. On 16 September 2021, a destructive Ms 6.0 earthquake broke the seismic quiescence of the Luxian county in the inner Sichuan Basin, China. Here, we explore the seismogenic structure and the postseismic stress condition of the Luxian earthquake through characterizing sedimentary faults in the spatiotemporal distribution of aftershocks, through the focal mechanism solutions and further stress inversion, and through the coseismic rupture model based on synthetic aperture radar interferometry (InSAR) data. Our results show that aftershocks are concentrated at two clusters in the broad Yujiasi syncline. Seismicity of the northern cluster reveals that the main shock ruptured an east-southeast striking fault with a dip angle of - 45 degrees to the southwest (F0), and activated a gently dipping (- 18 degrees) fault (F1) below F0 and a nearly vertical shallow fault (F2) on the northern side of F0. These three faults outline the edges of a thrust wedge in the sedimentary cover. The northern cluster occurred on a conjugate fault system within which steep faults with different dipping direction interlaced downward forming 'V' shapes. The main reverse rupture on the east-southeast striking F0 fault is inconsistent with the background northwest-southeast tectonic stress field. Combined with the morphology of anticlines, we suggest that the main shock was resulted from the localized NE-SW compressive stress concentration due to the inhomogeneous deformation of the sedimentary cover. Aftershocks with magnitude > 2.0 are characterized by the dominant normal slip. Coulomb stress change (ACFS) results show that normal slip is enhanced by the main rupture. However, the amplitude of ACFS (a few bars) is not large enough to reverse the dominant slip direction of faults. Postseismic stress inversion results show a temporary stress regime reversal from the nearly north-south subhorizontal compressive stress regime before the main shock to the normal slip favored stress regime with a subvertical maximum principal stress (sigma 1). We suggest that the Luxian Ms 6.0 earthquake as an unusual event completely released the localized horizontal compressive stress and hence caused a temporary reversal of the localized stress regime. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons .org /licenses /by-nc -nd /4 .0/).
WOS关键词TIBETAN PLATEAU ; LONGMEN SHAN ; FOLD BELT ; SEISMOGENIC STRUCTURES ; MECHANISM ; FAULT ; GEOMETRY ; BASEMENT ; INSIGHTS ; BENEATH
资助项目National Natural Science Foundation of China[4217040570] ; [41674059]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者ELSEVIER
WOS记录号WOS:001118785100001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 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/132A11/111519]  
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Liang, Chuntao
作者单位1.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China
2.Shaanxi Earthquake Agcy, Xian, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
4.Chengdu Univ Technol, State Key Lab Geohazard Prevent & Geoenvironm Prot, Chengdu 610059, Sichuan, Peoples R China
5.Chengdu Univ Technol, Key Lab Earth Explorat & Informat Technol, Minist Educ, Chengdu 610059, Sichuan, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Chaoliang,Liang, Chuntao,Liao, Jiangtao,et al. Temporary stress regime reversal immediately after the complete release of the localized compressive stress by the 2021 Luxian Ms 6.0 earthquake, Sichuan Basin[J]. EARTH AND PLANETARY SCIENCE LETTERS,2023,618:12.
APA Wang, Chaoliang,Liang, Chuntao,Liao, Jiangtao,Yao, Zhenxing,Xu, Rui,&Yang, Yihai.(2023).Temporary stress regime reversal immediately after the complete release of the localized compressive stress by the 2021 Luxian Ms 6.0 earthquake, Sichuan Basin.EARTH AND PLANETARY SCIENCE LETTERS,618,12.
MLA Wang, Chaoliang,et al."Temporary stress regime reversal immediately after the complete release of the localized compressive stress by the 2021 Luxian Ms 6.0 earthquake, Sichuan Basin".EARTH AND PLANETARY SCIENCE LETTERS 618(2023):12.

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来源：地质与地球物理研究所

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