Research on the active tectonics in the Far-Eastem Russia

远东的俄罗斯和日本群岛地区是地震活动的高发区，这一活动被解释为北美和欧亚板块之间的相对凸起或几个微板块之间的相互作用。尽管已经发生了许多危险的地震，但由于政治、地貌和气候困难等原因，活动构造的研究进展不是很好。我们进行了两年的考察，考察了该地区特别是库页岛的活动构造。具体地说，1)利用航空摄影技术对库页岛中南部的活动断裂和活动地貌进行了调查。揭示了许多活动断裂的位移速率和右行方向。2)对包括内切戈尔斯克地震断裂在内的几条特定活动断裂进行了地质地貌调查，分析了断裂的滑动速率和周期性。3)对施密特半岛萨哈林岛北端的基底地质进行了调查，该地区晚白垩世至第三纪变形沉积暴露较好，适合通过长期变形来分析综合变形。形变方面与现今的活动非常一致，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.