STUDY OF ACTIVE TECTONICS AND EVALUATION OF CRUSTAL STABILITY IN ENGINEERING SITE AREA FOR JINPING HYDROPOWER STATION ON YALONGJIANG RIVER, CHINA

The NE trending Jingpingshan XiaoJinhe fault zone obliquely passes through the engineering site area for Jinping Hydropower Station from northeast to southwest. In the southeastern and northwestern parts of the area exist the NNW trending Yangpingzi Zhichanggou fault set and NW trending Qianbo and Gaoniuchang faults, respectively. During late Quaternary most of the faults in this region has become except the Mashantou Zhoujiaping and Wake faults of the Jinpingshan Xiaojinhe fault zone as well as the NW trending Qianbo fault, which were still weakly active at that time. The neotectonic movement in the engineering site area was dominated by the uplift of the whole region accompanied by horizontal displacement and rotation in historic and recent time. Therefore, the crust in the studied area is relatively stable.