Abstract: The Liangshan active fault zone, trending nearly from north to south, lies at the southeast margin of the Qinghai Tibet Plateau, the east side of Xianshuihe-Anninghe-Zemuhe-Xiaojiang fault zone. It consists of 3 right-separation segments from north to south:the Puxionghe fault, the Butuo fault and the Sikai-Jiaojihe fault. Geological mapping indicates that the fault zone motion is dominated by left-lateral slip in Late Cenozoic Era, and the total amount of displadment is 13.5～15.5km. In late Quaternary, the Liangshan fault zone offset a series of geological and geomorphological bodies and the average left-lateral slip rate is about 2mm/a.

Key words: Liangshan active fault zone, Displacement amount, Slip rate, Late Cenozoic Era, Late Quaternary

摘要： 凉山近南北向活动构造带位于青藏高原东南边缘鲜水河-安宁河-则木河-小江断裂带中段东侧,与鲜水河断裂带左阶雁列,与小江断裂带右阶雁列。大体呈南北或北北西方向展布的凉山构造带,自北而南主要包括普雄河断裂、布拖断裂和四开-交际河断裂。晚新生代以来的活动,凉山南北向构造带以明显的左旋走滑为特征,相应的倾滑位移分量不大。初步统计得到其晚第四纪以来的走滑速率为2mm/a左右,晚新生代以来位移规模13.5～15.5km。凉山活动构造带的活动,弥补了鲜水河-安宁河-则木河-小江断裂带中段安宁河-则木河断裂带活动存在的位移和速率亏损,对于全面评价青藏高原东南边缘的地壳运动和变形模型具有重要意义。

关键词: 凉山活动构造带, 位移规模, 滑动速率, 晚新生代, 晚第四纪