摘要
嫩江断裂带是松辽盆地的西边界断裂,但受第四系强覆盖等研究条件的限制,前人对该断裂第四纪构造活动的研究较少。本文针对该断裂带北段开展了野外地质调查,并综合大地电磁测深和纵波速度结构等结果,初步研究了嫩江断裂带北段的第四纪活动特征。调查发现,该断裂北段主要发育地貌陡坎、基岩滑坡、地层揉皱变形、近垂直擦痕、基岩崩塌与线性断塞塘等特征。探槽古地震研究揭示断裂带北段在(80.9±4.6)—(62.9±2.3)ka BP曾发生1次古地震事件,运动方式为正断,垂直位移量约1.5m,震级约为MS 7.1—7.3,断裂在晚更新世曾发生过强烈活动。研究结果有助于认识了解该断裂和松辽盆地的第四纪构造变形过程,并为评价该断裂及邻区的地震活动潜势提供参考。
The Nenjiang fault zone(NJFZ)is the western boundary fault of the Songliao basin,and the Quaternary tectonic deformation of which remains to be understood well because of unfavorable working conditions such as intensive Quaternary coverage.This paper focuses on the Quaternary tectonic activities of the northern section of the NJFZ based on the integrated results of field geological investigation,MT data inversion and P-wave velocity structure.Abundant tectonic evidences are observed along the northern section of the NJFZ such as geomorphic scarps,bedrock landslide,crumple deformation of strata,vertical scratch,and bedrock collapse and linear sag ponds.The trench reveals that at least one normal paleo-event occurred between(80.9±4.6)ka BP and(62.9±2.3)ka BP,which caused 1.5 m vertical displacement with an estimated magnitude MS 7.1—7.3,which means that the NFFZ was activated during the late Pleistocene.The results not only help us to understand the Quaternary tectonic deformation process of the NJFZ and the Songliao basin,but also provide references for the assessment of the earthquake potential along the NJFZ and its neighbor areas.
作者
殷娜
余中元
周兆军
王鹤
李莹甄
赵斌
Yin Na;Yu Zhongyuan;Zhou Zhaojun;Wang He;Li Yingzhen;Zhao Bin(Institute of Disaster Prevention,Sanhe 065201,Hebei,China;Heilongjiang Earthquake Agency,Harbin 150090,China)
出处
《震灾防御技术》
CSCD
北大核心
2019年第1期164-173,共10页
Technology for Earthquake Disaster Prevention
基金
河北省教育教学研究与改革实践项目(2016GJJG246)
防灾科技学院教育研究与教学改革项目(JY2016B03)
中央高校基本科研业务费专项(ZY20180204)联合资助
关键词
嫩江断裂带北段
晚更新世
活动特征
Northern section of the Nenjiang fault zone
Late Pleistocene
Activity characteristics
作者简介
殷娜,女,生于1985年。讲师。主要从事灾害学方面的教学及活动构造与地震活动性方面的研究。E-mail:yinnaeq@qq.com;通讯作者:余中元,男,生于1982年。副教授。主要从事地震地质与地震工程方面的研究。E-mail:yuyangzi9811@126.com。
