Abstract: Using remote sensing (RS) data, the major active faults of the eastern margin of Altai Mountains——the Hovd Fault and the Har-Nuur Fault, are studied, the detailed rupture character is analyzed from a viewpoint of topographic features, and the fault geometry and kinematics characteristics are revealed. Preliminary researches indicate the scale, slip-rate and strong seismic activity of active faults along the eastern margin of Altai Mountains are not weaker than those of the southwest’s. The Hovd Fault is of NNW-direction right-lateral strike-slip, with the length of 600 km, the maximal right-lateral displacement of river system of 9km since mid-Pleistocene(Q_p²), the possible slip-rate of 3.8～12.3mm/a,and the approximate average slip-rate of 7.8mm/a; The Har-Nuur Fault is of NNW-direction right-lateral strike-slip, with the length of 480 km. The fault is obviously active since Holocene(Qh), and there are signs of the latest faulting on the alluvial fans of Quaternary. So, the intense neotectonic movement and seismic activity on the eastern margin of Altai Mountains are related to the collision of India-Eurasia plate and maybe to the regional kinematic process.

Key words: RS, Altai Mountains, Hovd Fault, Har-Nuur Fault

摘要： 文中采用遥感资料,对阿尔泰山东缘的主要活动断裂---科布多(Hovd)断裂与哈尔乌苏湖(Har-Nuur)断裂进行研究,从地貌特征上对断裂进行详细分析,揭示其几何学和运动学特征。初步研究表明阿尔泰山东缘的活动断裂规模、滑动速率和强地震活动并不弱于其西南缘。其中科布多断裂走向NNW,右旋走滑,长约600km,中更新世(Q_p²)以来最大水系右旋位错约9.0km,滑动速率可达3.8～12.3mm/a,平均滑动速率约7.8mm/a;哈尔乌苏湖断裂走向NNW,右旋走滑,长约480km,全新世以来活动性明显增强,第四纪洪积扇上发现有最新的断裂迹象。阿尔泰山东缘的新构造运动与强地震活动,除了与印度-欧亚板块碰撞作用有关外,可能还与局部地区的动力学过程有关。

关键词: 遥感, 阿尔泰山, 科布多断裂, 哈尔乌苏湖断裂