苏北—滨海断裂北段最新活动时代研究  

Characteristics and Activity of the Northern Segment of the Littoral Fault Zone at Northern Jiansu Region

作　　者：朱孟浩 闵伟[1] 刘金瑞 任治坤[1] 冯英辞 Zhu Menghao;Min Wei;Liu Jinrui;Ren Zhikun;Feng Yingci(Key Laboratory of Seismic and Volcanic Hazards,Institute of Geology,China Earthquake Administration,Beijing 100029,China;Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China;Innovation Academy of South China Sea Ecology and Environmental Engineering,Guangzhou 510301,China)

机构地区：[1]中国地震局地震与火山灾害重点实验室,中国地震局地质研究所,北京100029 [2]中国科学院边缘海与大洋地质重点实验室,南海海洋研究所,广州510301 [3]中国科学院南海生态环境工程创新研究院,广州510301

出　　处：《震灾防御技术》2021年第1期29-38,共10页Technology for Earthquake Disaster Prevention

基　　金：国家重点研发计划(2017YFC1500401)。

摘　　要：苏北-滨海断裂在江苏以北的存在与活动性长期以来存在争议。本研究通过小多道地震探测技术,对苏北-滨海断裂北段及附近海域进行探测,识别出4个反射界面,将研究区第四纪地层划分为4个地震层序,分别对应全新世、晚更新世、中更新世和早更新世4个地质时期。对照区域地质构造,对地震剖面断点进行分析,认为断点F1、F2、F3、F4、F8、F9、F10对应为苏北-滨海断裂,断裂错动的最新地层为晚更新世,因此推断苏北-滨海断裂为晚更新世活动断裂。The activity of the northern segment of littoral fault zone at northern Jiangsu is still unclear and in debate.In this study,we carried out small mini-multichannel seismic survey across the northern segment of the littoral fault zone and around the adjacent sea area.There are four reflection interfaces were identified from the seismic reflection profiles.The Quaternary stratigraphy in the study area was divided into four seismic sequences corresponding to four geological periods,as Holocene,Late Pleistocene,Middle Pleistocene and Early Pleistocene.According to the regional geological structure,the fracture points F1,F2,F3,F4 and F8,F9 and F10 correspond to the northern littoral fault zone in the study are,and the latest strata of fault movements are in the Late Pleistocene.Therefore,it can be inferred that the northern segment of the littoral fault zone is of Late Pleistocene activity at Northern Jiangsu region.

关 键 词：小多道地震 苏北—滨海断裂 断裂活动性 

分 类 号：P542[天文地球—构造地质学] P315[天文地球—地质学]