苏北盆地NE向断裂对盐泰锡常宜铁路工程影响  

Research on the Influence of the NE Trending Faults in the Subei Basin on the Yan-Tai-Xi-Chang-Yi Railway Project

作　　者：张鹏 邢云 孟科[2] 刘嘉彬 王晓东 毛健伟 ZHANG Peng;XING Yun;MENG Ke;LIU Jiabin;WANG Xiaodong;MAO Jianwei(Traffic and transportation engineering,Nanjing Tech University,Nanjing,211816;Jiangsu Earthquake Agency,Nanjing,210014;Shanghai Su mu Detection Techniques Co.,Ltd.,Shanghai,201707)

机构地区：[1]南京工业大学交通运输工程学院,南京210009 [2]江苏省地震局,南京210014 [3]上海苏牧探测技术有限公司,上海200011

出　　处：《华北地震科学》2023年第2期22-31,42,共11页North China Earthquake Sciences

基　　金：镇江市政府项目“镇江市活动断层探测与地震危险性评价”(ZJZCFS-2017-0006)。

摘　　要：通过对盐城、泰州地区浅层地震勘探工作,对盐城、泰州地区主要NE向断裂的第四纪活动性进行了研究,获得了以下认识:盐城-南洋岸断裂、南阳断裂展布于新构造强烈坳陷区,控制了新近系及第四系沉积;主断层倾向北,在浅部同时发育反向断层构成“Y”字型断层组合,为晚更新世活动断层,地震危险性较大,具有发生6.5级左右地震的构造背景;陈家堡-小海断裂和泰州断裂与本线路相交段最新活动时代为中更新世,在浅部各由2条北倾的正断层组成,分别组成高邮凹陷和溱潼凹陷南缘的铲式断阶带,对晚第四纪地层无明显影响。综合浅层地震勘探成果及新建盐泰锡常宜铁路周边地质资料分析,在工程线路范围内未发现活动断裂存在,可不考虑活动断裂地表错动对工程线路的影响。There are a number of NE-trending faults in the Subei basin,some of them may be late Quaternary active faults.Whether there are active faults that may cause surface rupture is of great significance to the seismic fortification of the newly-built Yan-Tai-Xi-Chang-Yi railway project and whether to take engineering fault-resistance or avoidance measures.Based on the shallow seismic exploration in Yancheng and Taizhou,this paper studies the Quaternary activity of major NE-trending faults in Yancheng and Taizhou,and obtains the following understandings:the Yancheng-Nanyangyan Fault and the Nanyang Fault are distributed in the strong depression area of the neotectonic structure,and control the Neogene and Quaternary deposits.The main fault is inclined to the north,and reverse faults are simultaneously developed in the shallow part to form a"Y"-shaped fault combination.These two faults are active faults in the Late Pleistocene,with high seismic risk,and have the tectonic background for earthquakes of about M6.5.The seismic fortification of the Yan-Tai-Xi-Chang-Yi railway project needs to consider their influence as the seismogenic structure of destructive earthquakes.The latest active age of the intersection of the Chenjiabao-Xiaohai fault and the Taizhou fault with this railway line is the Middle Pleistocene.In the shallow part,both of them are composed of two normal faults dipping north,respectively forming the shovel faults in the southern margin of the Gaoyou Depression and the Qintong Depression,and has no significant impact on the Late Quaternary strata.Based on the analysis of shallow seismic exploration results and the geological data,no active faults are found within the scope of the railway line,so it is not necessary to consider the influence of surface dislocation of active faults on the railway line.

关 键 词：苏北盆地 第四纪活动性 浅层地震勘探 盐城-南洋岸断裂 陈家堡-小海断裂 

分 类 号：P315.9[天文地球—地震学]