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Active Features of the Hangingwall on the listric Normal Fault Along the Southeastern Margin of Weihe Basin

Earthquake Research in China 1995年第3期9卷 87-92页

作者： Hou Jianjun,Bai Taixu,Liang Haihua,Zheng Wentao,and Wang ShiminDepartment of Geology,Peking University,Beijing 100871 China

Based on field observations and mechanic analysis,the authors think that synthetic faults,antithetic faults,and hangingwall cross-faults are formed on the piedmont alluvial-pluvial plain under the action of hangingwall blocks sliding downward and rotating along concave fault planes of the listric normal fault on the southeastern margin of Weihe *** characteristics of different movements and expressions on the surface of these structures may be taken as the main marks for listric normal fault segmentation.

关键词： faulting listric fault finite element modeling Weihe Basin

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The Influence of Thrust Fault Structure on Cross-fault Short-leveling Survey

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Earthquake Research in China 2019年第3期33卷 489-502页

作者： YUE Chong QU Chunyan YAN Wei ZHAO Jing SU Qin Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China China Earthquake Networks Center Beijing 100045China Survey Engineering Institute Sichuan Earthquake AgencyYa'an 625000SichuanChina

Aiming at different variation patterns of cross-fault short-leveling before earthquakes,the paper establishes the 2-D finite-element models with different crustal stratification and fault occurrence perpendicular to Longmenshan fault zone. By contact analysis and viscoelastic finite element method,the influence of fault structure on cross-fault short-leveling is obtained under the same constraint conditions,the results show that:with the increase of the horizontal projection distance of fault,the cumulative displacements of surface increase gradually in the models with fixed dip angles of the fault plane(model 1). However,when the horizontal projection distance exceeds 20 km,the influence of fault?s dip angle on the cumulative displacements of surface short-leveling will decrease significantly,and the cumulative displacements are maintained at about 1. 5 m. However,in the listric fault models(model 2),when the projection distance is less than 20 km,the listric fault structure impedes the sliding of fault. The short-leveling variation rate is only half of model 1;as a result,the ability to reflect the regional stress enhancement by cross-fault short-leveling is further weakened. But when the horizontal projection distance exceeds25 km,the cumulative displacements significantly increase,with the maximum displacement reaching 1. 75 m. The results of equivalent stress show that the listric fault structure causes a sudden increasement in equivalent stress when the horizontal projection distance is 10 km,higher equivalent stress values are accumulated between the projection distance of 5-20 km,and then high-low stress difference zones are formed at the bottom of the fault plane and near the transition zone of low-high dip angle.

关键词： Cross-fault short-leveling Finite element listric fault structure Equivalent stress

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