STUDY ON CHARACTERISTICS AND SEISMIC ACTIVITY OF GAOQIAO FAULT IN HEAD AREA OF THREE GORGES RESERVOIR
三峡工程库首区高桥断裂特征与地震活动性研究

The property and seismicity of Gaoqiao fault is analyzed by use of geologic and seismological method.The results show:1)The scale of Gaoqiao fault is large.It is a fault at the top of the earth's crust.The new aitivity age was earlier period of the late Pleistocenc;2)The perineability structure of the fault is distributed conduit that is useful for infiltration of underground water.3)there are obvious seismic activity before and after impoundment of the Three Gorges Reservoir along Gaoqiao fault zone;4)After impoundment,the seismicity of Gaoqiao fault behaves as a energy releasing in the form of medium frequency and low intensity;5)Gaoqiao fault is a potential seismic risk region in this area and vicinity,where will occur tectonic reservoir-induced seismicity of %M %s3.0-4.0.