摘要
丹江口地区地震地质因修建丹江水库而得到深入研究,但针对断裂进行的系统性研究较少。通过对丹江断裂东段进行1:1万大比例条带状活动断裂填图,综合采用地质地貌调查、岩样年龄测试、地质钻探、浅层地震勘探等多种手段进行研究,认为:1)丹江断裂东段第四纪以来累积左旋走滑量在250~500m之间,上更新统地层垂直断距为10~20m;2)断裂最新活动时代为晚更新世,活动性质以由NE向SW的逆冲为主,兼具有左旋走滑分量;3)断裂活动性由山地向盆地迁移。丹江断裂晚更新世以来活动表明,南襄盆地西缘活动性较强。该认识可为进一步评估丹江口地区乃至南襄盆地西缘的地震构造环境提供依据。
The seismicity of the Danjiangkou area is well studied for the need of reservoir building. Using different ways such as geological-geomorphological survey, geological age testing, drilling and shallow seismic exploration, we carried out a 1:10 000 scale geological mapping on active faults. It is found that:1) The accumulated sinistral strike slip is 250-500 m of the eastern segment of the Danjiang fault since the Quaternary, and the vertical fault throw is 10-20 m in the Upper Pleistocene stratum. 2) The last active period of the fault is in late Pleistocene and the mechanism is characterized by thrusting of the slip from NE to SW. 3) The fault activity migrates from hill to basin, meaning that the new active site moves to the basin side. 4) The fault in Late Pleistocene shows that the western edge is more active than the other edges. This study provides an important reference for further evaluation of the seismic-tectonic environment of the Danjiangkou area and the west margin of the Nanyang-Xiangfan basin.
作者
雷东宁
乔岳强
胡庆
王秋良
林松
李雪
Lei Dongning;Qiao Yueqiang;Hu Qing;Wang Qiuliang;Lin Song;Li Xue(Key Laboratory of Earthquake Geodesy,Institute of Seismology,China Earthquake Administration,Wuhan 430071,China;Wuhan Institute of Earthquake Engineering Co.,Ltd.,Wuhan 430071,China;Zhejiang Earthquake Agency,Hangzhou 310013,China)
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2019年第5期1362-1375,共14页
Journal of Jilin University：Earth Science Edition
基金
中国地震局地震研究所基本科研业务费专项资助项目和中国地震局地壳应力研究所基本科研业务费专项资助项目(IS2018126278)
中国地震局社会公益研究项目(1521401800062)~~
关键词
南襄盆地
丹江断裂
地貌陡坎
垂直断距
逆冲断层
Nanyang-Xiangfan basin
Dangjiang fault
landform scarp
vertical slip
thrust fault
