首页|Three-dimensional fault model and features of chained hazards of the Luding Ms 6.8 earthquake,Sichuan Province,China

Three-dimensional fault model and features of chained hazards of the Luding Ms 6.8 earthquake,Sichuan Province,China

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The Ms 6.8 Luding earthquake in 2022 is located on the NNW-trending Moxi segment of the Xianshuihe fault with left-lateral strike-slip behavior.This area is where the Xianshuihe,Anninghe,Daliangshan and Longmenshan faults intersect.China Earthquake Administration has identified that intersection area,among the Moxi segment of the Xianshuihe fault,the Anninghe fault,the Daliangshan fault and the southern part of the Longmenshan fault,as a high-magnitude earthquake hazard area.According to existing data on the Luding earthquake,including the focal parameters,the spatial distribution of re-located aftershocks,dominated azimuth of the earthquake in-tensities and earthquake-induced ground fissures,we built a 3D earthquake fault model.We found that two discontinuous NNW-trending vertical strike-slip faults with left stepping were the seismogenic faults of the Luding earthquake.Its coseismic left-lateral dislocation triggered transtensional slips and aftershocks on the NW-trending secondary faults at its northernmost tensile area.Meanwhile,local crustal coseismic shortening on the side of Mt.Gongga triggered the aftershocks on the NE-and NW-trending secondary conjugated strike-slip faults,which were confirmed by GNSS observations and InSAR deformation field around the epicenter.This earthquake rupturing pattern also controlled the spatial distribution of the earthquake intensity Ⅸ area and earthquake chain hazards.The Coulomb stress calculation shows that the Luding earthquake increases the risk of high-magnitude earth-quake occurrence on the southernmost part of the Xianshuihe fault and the Anninghe fault.Finally,we suggested doing good monitoring of the Anninghe fault and the southernmost part of the Xianshuihe fault and avoiding active faults with seismogenic capacity and areas prone to earthquake-chained hazards during the site selection and planning of reconstruction.

Luding earthquake3D earthquake faultCoseismic surface ruptureEarthquake chained hazardsStatic coulomb stressXianshuihe fault

Xiwei Xu、Qixin Wang、Junjie Ren、Kang Li、Qi Yao、Chong Xu、Yongsheng Li、Yanfen An、Jia Cheng

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School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing,100083,China

National Institute of Natural Hazards,Ministry of Emergency Management,Beijing 100085,China

Key Laboratory of Compound and Chained Natural Hazards Dynamics,Ministry of Emergency Management of China,Beijing,100085,China

Institute of Earthquake Forecasting,China Earthquake Administration,Beijing,100036,China

Institute of Geology,China Earthquake Administration,Beijing,100029,China

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2024

10.1016/j.eqrea.2024.100326

地震研究进展(英文)
中国地震局

地震研究进展(英文)

影响因子：0.032
ISSN：2096-9996
年,卷(期)：2024.4(4)