开封断裂第四纪活动特征  

Quaternary Activity Characteristic of the Kaifeng Fault

作　　者：孙杰 张予川 徐婉君 李涛 张扬 Sun Jie;Zhang Yuchuan;Xu Wanjun;Li Tao;Zhang Yang(Henan Earthquake Agency,Zhengzhou 450016,China;Earthquake Agency of Kaifeng City,Kaifeng 475000,Henan,China)

机构地区：[1]河南省地震局,郑州450016 [2]开封市地震局,河南开封475000

出　　处：《震灾防御技术》2022年第2期234-241,共8页Technology for Earthquake Disaster Prevention

基　　金：中央公益性科研院所基本科研业务专项(IGCEA1902);中国地震局地震科技星火计划项目(XH20037);开封市活动断层探测与地震危险性评价服务项目;河南省地震构造探查工程项目。

摘　　要：开封断裂是郑州-开封断裂带的重要组成部分,也是黄河中下游平原的一条重要控制性断裂。利用浅层地震勘探发现,开封断裂为总体走向EW,倾向N的正断层;断裂分为东、西2支,断裂活动性具有明显的分段特征,东支活动性较西支强。钻孔联合剖面揭示开封断裂东支断裂上断点埋深27~35 m,根据地层年代学结果,其最新活动时间为晚更新世。研究成果为开封市城乡规划、重大工程选址和地震区划工作提供了重要的基础数据。Kaifeng fault is an important segment of Zhengzhou-Kaifeng fault zone,and it is also an important controlling fault in the middle and lower reaches of the Yellow River Plain.It is found that Kaifeng fault is a normal fault with overall strike EW and dip N by using shallow seismic exploration.The fault can be divided into East and West branches,and has obvious differentiated segmented characteristics.The activity of the East branch is stronger than that of the West Branch.The borehole joint geological profile reveals that the buried depth of the breakpoint on the fault is between 27 m and 35 m.Combining with the chronological results,the latest age of activity is the late Pleistocene.The results can provide important basic data for Kaifeng urban and rural planning,major project site se-lection and seismic zoning.

关 键 词：开封断裂 断裂活动性 地震反射剖面 钻孔联合剖面 

分 类 号：P315.2[天文地球—地震学] P542.3[天文地球—固体地球物理学]