Controlling Influence of Reservoir Water Level on Local Seismic Energy Release

We present an evidence of reservoir induced controlling influence of water level periodic changes in Enguri high dam reservoir on regional seismic activity. Data sets of water level daily variations in the Enguri high dam reservoir and the seismic data sets recorded by the local network have been analyzed. Monthly frequency of earthquake occurrence has been calculated. According to our results decrease in daily seismic energy release around Enguri high dam during water level periodic variation can be assumed as a control of seismic activity. This controlling influence may be explained as a result of phase synchronization of complex seismic process with small periodic changes in the reservoir water level. © 2007 Bull. Georg. Natl. Acad. Sci.