综合地球物理方法在山前隐伏断裂探测中的应用——以巍山—长山南坡断裂为例  

Application of integrated geophysical methods in detection of piedmont buried faults:a case study of the Weishan-Changshan south slope fault

作　　者：赵建明[1] 李明[2,3] 费书民 张志相[1] 高嘉琳 ZHAO Jianming;LI Ming;FEI Shumin;ZHANG Zhixiang;GAO Jialin(Tangshan Central Seismic Station, Hebei Earthquake Agency, Tangshan 063000, Hebei, China;No.5 Geological Team of Hebei Bureau of Geology and Mineral Resources Exploration, Tangshan 063000, Hebei, China;Hebei Mingchuang Geological Exploration Co., Ltd., Tangshan 063000, Hebei, China)

机构地区：[1]河北省地震局唐山中心台,河北唐山063000 [2]河北省地矿局第五地质大队,河北唐山063000 [3]河北明创地质勘查有限公司,河北唐山063000

出　　处：《地震工程学报》2021年第5期1095-1102,共8页China Earthquake Engineering Journal

基　　金：河北省地震科技星火重点项目(DZ20190424079);河北省地震科技星火面上项目(DZ20190423051)。

摘　　要：针对探测山前隐伏断裂复杂困难的特点,以巍山—长山南坡断裂为例,采用浅层地震勘探和高密度电法勘探等地球物理方法并结合钻孔联合地质剖面资料,对巍山—长山南坡断裂的隐伏段的准确位置和活动性进行研究,确定断层的准确位置和产状等。研究结果表明,巍山—长山南坡断裂在唐山市区的隐伏段为S倾的正断层,倾角约78°,断距约3 m,上断点埋深约19 m;该断裂在市区的隐伏段为中更新世断裂,晚更新世以来不活动。In view of the complex and difficulty in the detection of piedmont buried faults,the Weishan-Changshan south slope fault was taken as an example in this paper.Combined with data of composite drilling geological section,the accurate location and activity of the buried section of the Weishan-Changshan south slope fault were studied by using shallow seismic exploration,high-density electrical exploration,and other geophysical methods,and the accurate location and occurrence of the fault were determined.The study results showed that the buried segment of Weishan-Changshan south slope fault in Tangshan city behaves as a south-dipping normal fault with an inclination of about 78°and a fault distance of about 3 m,and the up-breakpoint of the fault is at depth of about 19 m.The buried segment of the fault in Tangshan city is a middle Pleistocene fault,and not active since the late Pleistocene.

关 键 词：山前隐伏断裂 综合地球物理方法 钻孔联合地质剖面 活动性 

分 类 号：P546[天文地球—构造地质学]