曲江断裂南东段全新世滑动速率  

Holocene slip rate of southeastern segment of Qujiang fault

作　　者：荆振杰[1] 刘风香[2] 张井飞[1] 谢富仁[1] JING Zhen-jie;ZHANG Jing-fei;LIU Feng-xiang;XIE Fu-ren(Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;Geological Museum of China, Beijing 100034, China)

机构地区：[1]中国地震局地壳应力研究所,北京100085 [2]中国地质博物馆,北京100034

出　　处：《世界地质》2016年第3期778-784,819,共8页World Geology

基　　金：中央级公益性科研院所基本科研业务专项(ZDJ2013-15);国家科技支撑项目(2006BAC13B01)联合资助

摘　　要：高精度SPOT卫星影像和野外地质调查表明,曲江断裂南东段断错山前冲沟及河流Ⅰ级和Ⅱ级阶地,在探槽中见到断裂断错全新世地层,是一条右旋走滑的全新世活动断裂,兼有逆冲性质,断裂的最新活动是1970年通海7.8级地震。对曲江断裂典型走滑断错地貌进行研究,曲江断裂南东段在五街一带水平滑动速率为(3.36±0.1)mm/a,白林山一带水平滑动速率为(3.21±0.3)mm/a。The high-resolution digital S P O T images and field investigation show that the southeastern segment of Qujiang fault offset the youngest gullies and the I and II grade fluvial terraces. Qujiang fault is a Holocene active right-lateral strike-slip fault, along with some reverse component which offset the Holocene deposit in the trench.The latest activity event is the 7. 8 earthquake in Tonghai in 1970. Investigating typical landform offset by Qujiang fault, at the field of the Wujie and Bailinshan where is the southeastern segment of Qujiang fault, the right-lateral slip rate of this fault is (3. 36 ±0. 1) m m / a and (3. 21 ±0. 3 ) m m / a , respectively.

关 键 词：曲江断裂 全新世活动 滑动速率 断错地貌 

分 类 号：P534.632[天文地球—第四纪地质学] P542.3[天文地球—古生物学与地层学]