摘要
玉皇沟断裂是四川绵阳科技城新区内唯一的具有一定规模的断层,其第四系活动性对新区规划、建设和防震减灾具有重要意义。采用无人机航测、地震地质调查、探槽揭露、人工地震勘探、钻探联合剖面等探测方法研究其活动性。探测结果表明:1)该断层倾向SE,倾角20~30°,为一逆冲断层。2)在白垩系基岩区影像上线性构造明显,在第四系覆盖区无线性影像显示。3)人工地震勘探推断其上断点距地表15~20 m,未进入第四系覆盖层。4)钻孔联合剖面揭示断层两侧基覆面无错动。因此,综合判断玉皇沟断层至少在晚更新世以来未活动,其可能形成于喜马拉雅Ⅰ幕造山时期。
Yuhuanggou fault is the only fault of scale in Mianyang Science and Technology City New Area,and its quaternary activ-ity is of great significance to the planning,construction and earthquake prevention and disaster reduction of the area.In this paper,UAV aerial survey,seismic geological survey,trough disclosure,artificial seismic exploration,joint drilling section and other meth-ods were used to detect and reveal the activities of the fault.The detection results show that:1)the fault dip SE,with a dip Angle from 20°to 30°,is a thrust fault;2)The linear structure is obvious in the cretaceous bedrock area,but not in the Quaternary overburden area;3)Artificial seismic exploration infers that the upper breakpoint is from 15 m to 20 m above the surface and does not enter the Quaternary overburden layer;4)The joint borehole section reveals that there is no dislocation of the basal over-burden on both sides of the fault.Therefore,it is concluded that the Yuhuanggou fault has been inactive at least since the late Pleis-tocene,and may have been formed during the Himalayan Act I orogenic period.
作者
徐琳
陈永东
杨荣
官云彬
李海
庞仁俊
熊昌利
秦宇龙
XU Lin;CHEN Yongdong;YANG Rong;GUAN Yunbin;LI Hai;PANG Renjun;XIONG Changli;QIN Yulong(Northwest Sichuan Geological Team,Sichuan Bureau of Exploration and Development of Geology and Mineral Resources,Mianyan 621000,Sichuan,China;Sichuan Institute of Geological Survey,Chengdu 610081,Sichuan,China;Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,Sichuan,China;College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,Sichuan,China)
出处
《城市地质》
2023年第2期239-247,共9页
Urban Geology
基金
绵阳市活断层普查(MYZC-2020-71)资助。
关键词
绵阳
玉皇沟断层
活动性鉴定
人工地震勘探
Mianyang
Yuhuanggou fault
identification of activity
manual seismic survey
