Research on the active tectonics in the Far-Eastem Russia

俄罗斯远东和日本列岛地区是地震活动的高发区，其地震活动被解释为北美板块与欧亚板块之间的相对活动或几个微板块之间的相互作用。虽然发生了许多危险的地震，但由于政治、地貌和气候等方面的原因，活动构造的研究进展缓慢。通过2年的考察，对该地区的活动构造进行了研究，特别是对库页岛的活动构造进行了研究，具体包括：1）利用航空摄影资料，对库页岛中南部的活动断裂和活动地貌进行了研究。对包括涅夫切戈尔斯克地震断裂在内的几条具体活动断裂进行了地质地貌调查，并对有机样品进行了分析，确定了断裂的滑动速率和活动性; 3）对萨哈林岛北方端、施密特半岛、晚白垩世-第三纪变形沉积物出露良好，适合于长期变形综合分析，晚第三纪以来的北东向挤压作用有明确的记录。变形方面与目前的活动非常一致，这是板块边界构造的表现。

The region of Fareastern Russia and the Japaneses islands is the area where seismic activity is high, the activity has been interpreted due to relative convegence between the North America and Eurasia Plates or interaction among the several micro plates. Although many hazardous earthquakes have been taken place, research on active tectonics have not well progressed because of several reasons ; political, geomorphologic and climatic difficulties. We conducted two years expedition to investigate active tectonics of this region, especially in Sakhalin Islands.Specifically,1) we investigated active faults and active geomorphology in the central to southern part of Sakhalin islands by using aerophotographs. Displacement rate and sense of dextral of many active faults have been revealed.2) We conducted geological and geomorphologic investigation in several specific active faults including Nevchegorsk earthquake fault and analyzied organic samiples to determine the slip rate and periodicily of the faults.3) We also investigated basement geology of northern tip of Sakhalin Island, Schmidt Peninsula, where Late Cretaceous to Tertiary deformed sediments are well exposed and apppropriate to analyze integrated deformation through long term deformation.Northeast compression lasted since late Tertiary is clearly documented. The deformation aspects are very consistent with present activity which is a manifestation of the plate boundary tectonics.