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Comprehensive Multi-Level Exploration of Buried Active Faults:an Example of the Yinchuan Buried Active Fault

Chai Chizhang 1),Meng Guangkui 1),Du Peng 1),Wang Yin 1),Liu Baojin 2),Shen Weihua 1),Lei Qiyun 1),Liao Yuhua 1),Zhao Chengbin 2),Feng Shaoying 2),Zhang Xuehui 1),and Xie Xiaofeng 1) 1) Earthquake Administration of Ningxia Hui Autonomous Region,Yinchuan 750001,China2) Geophysical Exploration Center,China Earthquake Administration,Zhengzhou 450003,China  
The paper introduces the steps and methods of multi-approach,multi-level exploration of buried faults in thick Quaternary sediment regions by taking the test exploration of the Yinchuan active fault as example.Based on the comprehensive analyses of previous data,we choose the Xinqushao Village of Xingqing District of Yinchuan City as the test site for the comprehensive exploration.Firstly,we adopted shallow seismic investigation with group intervals of 10m,5m and 1m to gradually trace layer by layer the master fault of the Yinchuan buried fault from a deep depth to a shallow depth where drilling could be used.Then,with composite geological profile drilling,we determined the precise location and dip angle of the fault.The drilling show the buried depth of the upper offset point is 8.3m.Finally,large-scale trenching revealed that the actual buried depth of the upper offset point of the fault is 1.5m from the ground surface and there are paleoearthquake events of 5 stages.Combined with the preliminary result of corresponding sample age,we conclude the Yinchuan buried fault is a mid to late Holocene active fault.
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