Statistical Evaluation of Induced Seismicity at the Karkheh Dam, Iran

Journal of Structural Engineering and Geo-Techniques

مقاله 6، دوره 3، شماره 3، خرداد 2013، صفحه 11-16

نویسندگان

Seyed Majdedin Mir Mohammad Hosseini¹؛ Pegah Rajaei²

¹Professor of civil & Environmental Engineering AmirKabir University of Technology ,Tehran, Iran

²M.Sc. student of civil & Environmental Engineering AmirKabir University of Technology ,Tehran, Iran

چکیده

Karkheh Dam is the largest dam in Iran with a capacity of about 7.4×109 cubic meters and height of 127 meters. Since the first impoundment, increasing in seismic activity in the dam area has been observed that indicates the possible occurrence of reservoir-induced seismicity (RIS).In the present work, a preliminary evaluation is conducted firstly in order to investigate these observations. Based on the assessment of the number of earthquakes occurred in equal time periods before and after reservoir impoundment and their focal depths, it is concluded that RIS is happening in the dam site. Secondly, a cross-correlation method is applied in order to find the relationship between water level fluctuations and the variations of seismic activities. This analysis confirms a strong relationship between fluctuation of the water level and the number of seismicity events in the dam area.

کلیدواژه‌ها

Reservoir-induced Seismicity (RIS)؛ Karkheh Dam؛ Dam impoundment؛ Cross-Correlation method