analysis of the aftershock sequences of large earthquakes in iran

Seismic sequences are referred to as series of earthquakes in a region that occur over a certain period of time. typically, any seismic sequence consists of a main event and its associated events: foreshocks and aftershocks. aftershock events are associated with smaller magnitudes and with a time interval of between several minutes to severalyears after the main seismic earthquake, and their abundance decreases over time, until the rate seismicity is returned to the seismic level of the background and the process of seismic events reach a stable state (omori, 1894).