3D geomechanical modeling of the Xianshuihe fault zone, SE Tibetan Plateau: Implications for seismic hazard assessment
The Xianshuihe fault on the southeastern margin of the Tibetan Plateau is one of the most active intracontinental faults worldwide. At least 16 strong earthquakes (M > 6.5) have occurred on this fault since 1327 CE. To reasonably assess the future seismic hazard of this fault region, it is essential to gain a comprehensive knowledge of the fault kinematics and stress state. In this study, we developed a fine 3D geomechanical model of the Xianshuihe fault and its adjacent area, and obtained a spatially continuous contemporary kinematics and crustal background stress field of this region. Our modeled results show that the slip rate of the Xianshuihe fault is as high as 11 mm/a on the northwestern segment and generally decreases to ~9 mm/a on the southeastern segment (i.e. Moxi fault). The Yulongxi fault, a branch oblique to the Moxi fault, has different slip senses in different segments with a very low horizontal slip rate (<0.6 mm/a). In terms of stress, the study area is dominated by a transtensional faulting stress regime with E-W-trending maximum horizontal stress S, indicating the study area is mainly subjected to an E-W compression and N-S extension. Localized normal and thrust faulting regimes appear alternately along the Xianshuihe fault, showing an inhomogeneous stress state. The high normal stresses on the Songlinkou-Selaha segment and the Moxi fault combined with their relatively high slip rates, make us speculate that these two segments have the potential to produce strong earthquakes in the future. A relatively high seismic hazard is also ascribed to the Yulongxi fault based on the analysis of its geological and geodynamic environment.
First ; Corresponding
China Postdoctoral Science Foundation[2021M691408] ; National Natural Science Foundation of China
|WOS Research Area|
Geochemistry & Geophysics
Geochemistry & Geophysics
|WOS Accession No|
|EI Accession Number|
3D Modeling ; Earthquakes ; Fault Slips ; Geodynamics ; Geomechanics ; Hazards ; Seismic Response
|ESI Classification Code|
Geology And Geophysics:481 ; Geophysics:481.3 ; Seismology:484 ; Earthquake Measurements And Analysis:484.1 ; Secondary Earthquake Effects:484.2 ; Data Processing And Image Processing:723.2 ; Accidents And Accident Prevention:914.1 ; Mechanics:931.1
|ESI Research Field|
Cited Times [WOS]:4
|Document Type||Journal Article|
|Department||Department of Earth and Space Sciences|
1.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
2.Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
3.Institute of Risk Analysis,Prediction and Management (Risks-X),Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
4.School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing,100083,China
5.Key Laboratory of Neotectonic Movement and Geohazard,Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing,100081,China
|First Author Affilication||Department of Earth and Space Sciences|
|Corresponding Author Affilication||Department of Earth and Space Sciences; Southern University of Science and Technology|
|First Author's First Affilication||Department of Earth and Space Sciences|
Li，Xianrui,Gao，Ke,Feng，Yu,et al. 3D geomechanical modeling of the Xianshuihe fault zone, SE Tibetan Plateau: Implications for seismic hazard assessment[J]. TECTONOPHYSICS,2022,839.
Li，Xianrui,Gao，Ke,Feng，Yu,&Zhang，Chongyuan.(2022).3D geomechanical modeling of the Xianshuihe fault zone, SE Tibetan Plateau: Implications for seismic hazard assessment.TECTONOPHYSICS,839.
Li，Xianrui,et al."3D geomechanical modeling of the Xianshuihe fault zone, SE Tibetan Plateau: Implications for seismic hazard assessment".TECTONOPHYSICS 839(2022).
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