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Stress drop variations of the 2019 ML 6.0 Changning earthquake and its aftershock sequence in the southern Sichuan Basin, China

文献类型：期刊论文

作者Shen, Lin4,5; Zhao, Lian-Feng2,4,6; Xie, Xiao-Bi1; He, Xi4; Wang, Wei-Min3; Yao, Zhen -Xing4
刊名TECTONOPHYSICS
出版日期2023-12-20
卷号869页码:12
ISSN号0040-1951
关键词Asia Earthquake source observations Induced seismicity Joint inversion Seismicity and tectonics Site effects Guided waves
DOI10.1016/j.tecto.2023.230139
英文摘要The Lg-wave spectra are investigated for the 2019 Changning ML 6.0 earthquake and its 94 aftershocks with magnitudes above ML 2.8, which occurred in the southern Sichuan Basin, Southwest China. This earthquake sequence is potentially related to the water injection from nearby salt mining activities. Based on an established regional high-resolution broadband Lg-wave attenuation model, we correct the observed spectra for the atten-uation effect along the propagation path. By fitting the observed spectra from the Changning earthquake sequence with the theoretical source model, we estimate seismic moments and corner frequencies, from which the stress drops are calculated for the entire earthquake sequence. The results show that the stress drops are rather scattered, ranging from 0.16 MPa to 32 MPa with a median value of 0.78 MPa. Spatiotemporal variation of stress drops reflects strong fault heterogeneity and a complex stress release process, which is likely influenced by water injection and diffusion. Positive trends are observed between the stress drop and focal depth and between the stress drop and seismic magnitude. Relatively lower stress drops for most shallow events are possibly the indication of lowered normal stress by long-term fluid injection. No apparent relation is observed between the stress drop and the distance to the Shuanghe salt mine, where water was injected. Combining the actual water injection data and previous numerical simulation studies, we suggest that the salt mining-related water injection may lead to elevated pore pressure beyond the source region of the 2019 Changning earthquake. The increasingly cumulated underground water may have created pathways linking multiple fault systems, thus the possibility of future large induced-earthquakes cannot be ruled out.
WOS关键词MOMENT MAGNITUDE ; TIBETAN PLATEAU ; SHALE GAS ; NUCLEAR-EXPLOSIONS ; SOURCE PARAMETERS ; SALT MINE ; M-W ; WAVE ; LG ; ATTENUATION
资助项目National Natural Science Foundation of China[U2139206] ; National Natural Science Foundation of China[41974054] ; National Natural Science Foundation of China[41974061] ; National Natural Science Foundation of China[42104055] ; National Natural Science Foundation of China[2019CSES0103]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者ELSEVIER
WOS记录号WOS:001124396400001
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 ; 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/132A11/111673]  
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Zhao, Lian-Feng
作者单位1.Univ Calif Santa Cruz, Inst Geophys & Planetary Phys, Santa Cruz, CA 95064 USA
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, 19 Beituchengxilu, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Inst Tibetan Plateau Res, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
5.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
6.Chinese Acad Sci, Heilongjiang Mohe Observ Geophys, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Shen, Lin,Zhao, Lian-Feng,Xie, Xiao-Bi,et al. Stress drop variations of the 2019 ML 6.0 Changning earthquake and its aftershock sequence in the southern Sichuan Basin, China[J]. TECTONOPHYSICS,2023,869:12.
APA Shen, Lin,Zhao, Lian-Feng,Xie, Xiao-Bi,He, Xi,Wang, Wei-Min,&Yao, Zhen -Xing.(2023).Stress drop variations of the 2019 ML 6.0 Changning earthquake and its aftershock sequence in the southern Sichuan Basin, China.TECTONOPHYSICS,869,12.
MLA Shen, Lin,et al."Stress drop variations of the 2019 ML 6.0 Changning earthquake and its aftershock sequence in the southern Sichuan Basin, China".TECTONOPHYSICS 869(2023):12.

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来源：地质与地球物理研究所

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