北天山西段库松木楔克山山前断层新活动特征初探  

Preliminary Study on New Active Characteristics of Kusongmuxieke Mountain Front Fault in the West Segment of North Tianshan

作　　者：陈建波[1] 沈军[2] 李军[2] 杨继林[2] 胡伟华[2] 赵欣[3] 曾宪伟[1] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000 [2]新疆维吾尔自治区地震局,新疆乌鲁木齐830011 [3]新疆师范大学生命与环境科学学院,新疆乌鲁木齐830054

出　　处：《西北地震学报》2007年第4期335-340,共6页Northwestern Seismological Journal

摘　　要：库松木楔克山山前断层是位于北天山西段再生造山带北缘一条重要的边界断层，是本次新发现和确定的一条活动断层。断层分为东、中、西三段：东段主要由4条断层斜列组合而成，单条断层长度为9～13km，在晚更新世～全新世仍在强烈活动，晚更新世以来的垂直错动量为3～4m，垂直活动速率为0．23～0．33mm／a，全新世以来的垂直错动量为0．5～0．8m；中段断层活动错断了中更新世至全新世地貌，形成多级断层陡坎和长约8～10km的地震形变带，晚更新世以来垂直活动速率为0．5mm／a；西段自晚更新以来无活动显示。Kusongmuxieke mountain front fault is one of important border faults of the north fringe of rejuvenated orogenic belt in west segment of north Tianshan, it is found and determined in our research that it is an active fault. The fault can be divided into three segments. The east segment mainly consists of four en echelon faults with length of 9～13 km, and still moves inten- sively in Later Pleistocene and Holocene Epoch. Since Later Pleistocene, vertical slippage of single fault has been 3～4 m, vertical active rate is 0.23～0.33 mm/a, and vertical slippage of single fault is 0.5～0.8 m since Holocene Epoch. New movement of the middle segment dislocates different geomorphologic units which formed from Middle Pleistocene to Holocene Epoch, forms multilevel fault escarpments and a 8～10 km long earthquake deformation belt. Since Later Pleistocene the vertical active rate is 0.5 mm/a. The west segment has no movement since Later Pleistocene.

关 键 词：北天山 库松木楔克山山前断层 全新世活动断层 断层陡坎 活动速率 

分 类 号：P548[天文地球—构造地质学]