Volume 11 Article informations Seismic activity of Sidi Salem dam, NW Tunisia Sinda Gaieb, Imen Hamdi Nasr, Najet Shimi Abstract The Sidi Salem dam was built in Beja, a semi-arid region in Northwestern Tunisia, to protect the lower valley against floods, for irrigation, for water supply, and for power generation. It is the biggest artificial water reservoir in Tunisia. It is a compacted-earth dam with 73 m of high and 814 Mm3 water capacity. The seismic events in the studied area have been monitored by seismic network operated by the National Institut of Meteorology. The main aims of this study is to construe the correlation between water level in the reservoir and the induced seismicity. The first earthquake susceptible to be induced event was found out in 1987 with magnitude of 5 after complete filling of the dam. Shortly afterwards, an increase in the number of seismic events happened, and many seisms were noted. We suggest that this induced seismicity took place after the reservoir loading effect and also the postponed effect of the diffusion of pore pressure. The comparison between the seismic data and reservoir water level indicates that there is a correlation between the changes in the water level and the seismic activity.