Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (5): 1362-1375.doi: 10.13278/j.cnki.jjuese.20170318

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Quaternary Activity and Its Seismo-Geological Implication of Eastern Segment of Danjiang Fault

Lei Dongning1,2, Qiao Yueqiang1,2, Hu Qing1,2, Wang Qiuliang3, Lin Song1,2, Li Xue1   

  1. 1. Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China;
    2. Wuhan Institute of Earthquake Engineering Co., Ltd., Wuhan 430071, China;
    3. Zhejiang Earthquake Agency, Hangzhou 310013, China
  • Received:2017-12-30 Published:2019-10-10
  • Supported by:
    Supported by Scientific Research Fund of Institute of Seismology and Institute of Crustal Dynamics, China Earthquake Administration (IS2018126278) and Social Welfare Research Project of China Earthquake Administration (1521401800062)

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Abstract: The seismicity of the Danjiangkou area is well studied for the need of reservoir building. Using different ways such as geological-geomorphological survey, geological age testing, drilling and shallow seismic exploration, we carried out a 1:10 000 scale geological mapping on active faults. It is found that:1) The accumulated sinistral strike slip is 250-500 m of the eastern segment of the Danjiang fault since the Quaternary, and the vertical fault throw is 10-20 m in the Upper Pleistocene stratum. 2) The last active period of the fault is in late Pleistocene and the mechanism is characterized by thrusting of the slip from NE to SW. 3) The fault activity migrates from hill to basin, meaning that the new active site moves to the basin side. 4) The fault in Late Pleistocene shows that the western edge is more active than the other edges. This study provides an important reference for further evaluation of the seismic-tectonic environment of the Danjiangkou area and the west margin of the Nanyang-Xiangfan basin.

Key words: Nanyang-Xiangfan basin, Dangjiang fault, landform scarp, vertical slip, thrust fault

CLC Number: 

  • P631.4
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