幕府山-焦山断裂镇江段第四纪活动性  

RESEARCH ON THE CHARACTERISTIC OF QUATERNARY ACTIVITIES OF THE ZHENJIANG SECTION OF MUFUSHAN-JIAOSHAN FAULT

作　　者：张鹏 汪勇 范小平 许奎 刘嘉彬 ZHANG Peng;WANG Yong;FAN Xiao-ping;XU Kui;LIU Jia-bin(College of Transportation Science&Engineering,Nanjing Tech University,Nanjing 210009,China)

机构地区：[1]南京工业大学,交通运输工程学院,南京210009

出　　处：《地震地质》2022年第1期63-75,共13页Seismology and Geology

基　　金：国家自然科学基金(41874051);镇江市政府项目“镇江市活动断层探测与地震危险性评价”共同资助

摘　　要：幕府山-焦山断裂是南京、镇江地区的一条重要的近EW向断裂,与镇江一带多次破坏性地震密切相关。文中通过浅层地震勘探和钻孔联合剖面探测方法,对幕府山-焦山断裂镇江段的展布特征及第四纪活动性进行了系统研究。浅层地震勘探成果表明,幕府山-焦山断裂倾向N,倾角约为50°~60°,断距约为3~7m,以正断活动为主。桥头村场地中更新统之上的地层没有被断错的迹象,中更新统下蜀组下部已被断层断错,中更新统底界在断层两侧的位错量为3.2m。判断本场地幕府山-焦山断裂的最新活动时代为中更新世晚期,晚更新世以来无活动迹象。金山场地断层以正断活动为主,全新统没有断错迹象。经综合分析,幕府山-焦山断裂镇江段的最新活动时代为中更新世晚期,未发现晚更新世以来的活动迹象。根据测年结果分析,其最新活动时间在距今(222±22)ka之后、晚更新世之前。幕府山-焦山断裂是宁镇地区一条地震危险性较强的主要断裂,尤其是该断裂与NW向断裂的交界部位,具备破坏性地震的孕震环境,必须高度重视相关区域的震害防御相关工作。Running across the Zhenjiang and Nanjing area,the Mufushan-Jiaoshan Fault is an important near EW-trending fault in Nanjing and Zhenjiang area.It extends from Mufu Mountain through Yanziji,Qixia Mountain,and Longtan to Jiao Mountain of Zhenjiang,with a total length of about 75km.The overall trend of the Mufushan-Jiaoshan Fault is nearly east-west,dipping to the north,the southern side of the fault is Ningzhen Mountain,the north side is the hollow land along the river and the Yangzhou low hilly plain.The fault is divided into the western and eastern sections by the NW-trending fault near Xiashu Town in Jurong,namely the Mufushan-Qixiashan section and the Zhenjiang section.Due to the long-term activity of the Mufushan-Jiaoshan Fault,the northern part of the Mufu Mountain,Qixia Mountain and other complex anticlines suffered large-scale fault depression,forming the Yizheng Sag in the north and the Ningzhen Uplift in the south of the Yangtze River.There is a significant differential up-and-down movement of the fault block along the fault.In the Yizheng Sag,there are huge deposits of the Upper Cretaceous,as well as the thicker Paleogene and Neogene,indicating that the Mufushan-Jiaoshan Fault is a long-term active normal fault.On the Bouguer gravity anomaly map and aeromagnetic anomaly map,the expressions of the Mufushan-Jiaoshan Fault are very obvious,indicating that the fault has a large cutting depth and is a large-scale fault.There have been many destructive earthquakes in the Nanjing-Zhenjiang area,most of which occurred at the intersection of NW-trending faults and near-EW-trending Mufushan-Jiaoshan Fault.In particular,the Yangzhou M6 earthquake in 1624 had a great impact,and the Mufushan-Jiaoshan Fault is possibly the seismogenic structure of this earthquake.With the planning and construction of a series of Yangtze River crossing passages across the fault in Nanjing and Zhenjiang,whether the Mufushan-Jiaoshan Fault is an active fault and whether it has a greater earthquake risk also becomes the focus of attention

关 键 词：幕府山-焦山断裂 第四纪活动性 浅层地震勘探 钻孔联合剖面 

分 类 号：P315.2[天文地球—地震学]