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.
作者
朱孟浩
闵伟
刘金瑞
任治坤
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)
出处
《震灾防御技术》
CSCD
北大核心
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)。
关键词
小多道地震
苏北—滨海断裂
断裂活动性
Mini-multichannel seismic survey
Littoral fault zone
Fault activity
