摘要
兴隆山北缘断裂是兰州盆地南侧边界断裂,也是兰州地区最重要的活动断裂之一,全长约54 km,呈东段NW走向西段近EW走向的弧形断裂。在加里东和燕山运动期,兰州地区在近NE-SW向主压应力下,断裂主要表现为由南西向北东的逆冲活动性质。新生代以来（喜马拉雅运动期）,主压应力方向改变为NNE-SSW方向,断裂活动性质也随之发生改变,东段新活动表现为逆左旋运动,西段表现为正左旋运动。断裂的最新活动时代应为晚更新世早~中期,可能与兰州黄河Ⅲ级阶地的形成年代相对应。
The Northern marginal fault of Xinglong Mountain, which is also the southern margin of Lanzhou basin, is one of the most important active fault in Lanzhou area. The fault is about 54 km shows an arc shape with the eastern segment in NW direction and the western segment in EW direction. During the Caledonian and Yanshan Movements, the tectonic stress field in Lanzhou area were mainly a feature of compressive stress with principal direction of NE-SW. The fault keeps a thrust movement from SW to NE. In the Cenozoic era（Himalayan Movement）, the principal stress changed into NNE-SSW, and the activity of fault also changed to the thrust with left-lateral slip on eastern segment and normal with left-lateral slip on the western segment. The latest stage of activities was probably in the Early to Middle Late Pleistocene epoch, corresponding to the formation of Ⅲ terrace of Huanghe river in Lanzhou basin.
出处
《西北地震学报》
CSCD
北大核心
2009年第1期66-70,共5页
Northwestern Seismological Journal
基金
地震科学联合基金(A07122)
兰州市活断层探测与地震危险性评价项目
中国地震局兰州地震研究所论著编号:LC2009015
关键词
兰州
兴隆山
活动断裂
新活动
Lanzhou
Xinglong Mountain
Active fault
Recent activity
