Based on the Aswan reservoir (Egypt) microearthquake data during the period January 1982 to February 1990, the aftershock decay has been examined in comparison to the characteristics observed around the Koyna reservoir (India). It was noted that near the Aswan reservoir the value of decay constant ‘h’ in Omori’s law of aftershocks remained unchanged and close to 1 for immediate aftershocks (Kebeasy et al, 1987) and the microearthquakes up to the period 1990, limiting its use asa quantitative tool to distinguish reservoir sssociated from normal earthquakes. It was noted that a zone of seismic quiescence developed at a distance between 8 to 18 km from the main shock prior to four significant earthquakes of magnitude 3.9 or above. Keeping in view the low strange attractor dimension and ‘b’ values of the same order both these regions in the intraplate setting, extension of the model for Koyna region (Srivastava et al, 1991) suggests estimation of the future largest magnitude earthquake in Aswan region.