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Application of Integrated Geophysical Methods to the Detection of Buried Faults in Liuzhou,Guangxi

WU Jiaobing;GAO Pengfei;LU Junhong;LI Junliang;MENG Nanzhong;PAN Lili;Earthquake Administration of the Guangxi Zhuang Autonomous Region;  
Field investigations of earthquake geology show many buried fault zones existing in the Liubei District of Liuzhou City,of which the specific locations remain undetermined,and whether they are active is still unclear. Based on geological surveys,this work uses two geophysical methods,i. e.,high-density resistivity and seismic imaging,to explore these hidden fault zones and proves the results by drilling. Analysis of anomalies from these surveys permits to map three faults including their specific positions,strikes and widths. Then,it's proved that the locations of buried faults and the geophysical anomaly are the same place with drilling and geological survey,and the geometric and kinematic characters are also clearly identified. The research result shows that the active age of NNE Baima fault and NE Xiliu fault was early Quaternary,and SN Liugang fault was early-middle Pleistocene. Therefore,these buried faults are not active since late Pleistocene,the economic construction of Liubei region dosen't need to be away from these buried faults. This work can provide some safety and security for the development of Liubei region.
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