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Influence of regional background stress fields on the spontaneous rupture of the major faults around xiluodu dam,China

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Earthquake Science 2022年第5期35卷 398-409页

作者： Li Liao Ping′en Li Jiansi Yang Jianzhou Feng Institute of Geophysics China Earthquake AdministrationBeijing 100081China Beijing Baijiatuan Earth Sciences National Observation and Research Station Beijing 100095China

Simulations of the spontaneous rupture of potential earthquakes in the vicinity of reservoir dams can provide accurate parameters for seismic resilience assessment,which is essential for improving the seismic performance of reservoir *** simulations of potential spontaneous ruptures,fault geometry,regional stress fields,constitutive parameters of the fault friction law,and many other factors control the slip rate,morphology,and dislocation of the rupture,thereby affecting the simulated ground motion *** focus of this study was to elucidate the effects of the background stress field on the nucleation and propagation of spontaneous ruptures based on the factors influencing potential M>7 earthquake events on the Leibo Middle Fault(LBMF)and the Mabian-Yanjing Fault(MB-YJF)in the xiluodu dam(XLD)*** simulation results show that the magnitude of the regional background stress field plays a decisive role in whether a destructive earthquake exceeding the critical magnitude will *** found that the direction and magnitude of the regional stress significantly affect the range of rupture propagation on the fault plane,and fault geometry affects the spatial distribution of the rupture *** the same regional stress field magnitude and orientation,a more destructive,high-magnitude earthquake is more likely to occur on the LBMF than on the MB-YJF.

关键词： xiluodu dam regional background stress field spontaneous rupture simulation

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Seismic hazard analysis for engineering sites based on the stochastic finite-fault method

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Earthquake Science 2022年第5期35卷 314-328页

作者： Ruifang Yu Yisheng Song Xiangyun Guo Qianli Yang Xinjuan He Yanxiang Yu Institute of Geophysics China Earthquake AdministrationBeijing 10081China

Seismic hazard analyses are mainly performed using either deterministic or probabilistic ***,there are still some defects in these statistical model-based approaches for regional seismic risk assessment affected by the near-field of large ***,we established a deterministic seismic hazard analysis method that can characterize the entire process of ground motion propagation based on stochastic finite-fault simulation,and we chose the site of the xiluodu dam to demonstrate the *** method can characterize earthquake source properties more realistically than other methods and consider factors such as the path and site attenuation of seismic *** also has high computational efficiency and is convenient for engineering *** first analyzed the complexity of seismogenic structures in the xiluodu dam site area,and then an evaluation system for ground motion parameters that considers various uncertainties is constructed based on a stochastic finitefault ***,we assessed the seismic hazard of the dam site area *** proposed method was able to take into account the complexity of the seismogenic structures affecting the dam site and provide multi-level parameter evaluation results corresponding to different risk *** results can be used to construct a dam safety assessment system of an earthquake in advance that provides technical support for rapidly and accurately assessing the post-earthquake damage state of a dam,thus determining the influence of an earthquake on dam safety and mitigating the risk of potential secondary disasters.

关键词： xiluodu dam seismic hazard ground motion parameters seismogenic structures

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维普期刊数据库

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