This study focuses on the distribution
of aftershocks in both location and magnitude for recent earthquakes in Iran. 43 Earthquakes are investigated, using data from the global International Seismological Center (ISC) seismic catalogue and from the regional earthquake catalogue
of the
Institute of Geophysics, University
of Tehran (IGUT) between 1961-2006 and 2006-2012 respectively. We only consider the earthquakes with magnitude greater than 5.0. The majority
of these events are intracontinental, occurring over four seismotectonic provinces across Iran. Processing aftershock sequences reported by both catalogues with cut-
off magnitude
of 2.5 and a sequence duration
of 70 days, leads us to define a spatial horizontal area (
A) occupied with the aftershocks as a function
of mainshock magnitude (
M) for Persian earthquakes: ISC: Log
10(
A) = 0.45
MS + 0.23; IGUT: Log
10(
A) = 0.25
MN + 1.7.
Also we found a range for the difference between the magnitudes of the strongest aftershock and of the mainshock in each sequence, which varies from 鈭?.9 (ISC) to 鈭?.27 (IGUT). Finally, the spacial distribution of the aftershocks corresponds reasonably well to the causative fault planes of earthquakes.