关键词: 遥感, 阿尔泰山, 科布多断裂, 哈尔乌苏湖断裂

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