زهره ریاضی - دانشجوی دکتری ژئوفیزیک دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران-
محمدرضا قیطانچی - عضو هیئت علمی موسسه ژئوفیزیک، دانشگاه آزاد اسلامی واحد علوم و تحقیق

Energy released indicates at the most region estimated with aftershocks. For investigation aftershocks, local station data of Iran at 40 years studied. Aftershocks fixed with physical form. The result indicate aftershock time function of potential region, the distribution of aftershocks suggest that use, Omori, Utsu, Mogi and Kisslinger relations, then aftershock reduce curves draw for 1962 Buin-Zahra, 1968 Dasht-e-Bayaz,1990 Rudbar,1990 Fork, 1997 Ardabil, 2002 Avaj and 2005 Zarand earthquake aftershocks. for sequence indicated aftershock current rate. The result indicates physical and dynamical behavior crust. With this study for aftershocks reduce models and curves, the modified Omori model was best fitted for the later stage of the aftershock sequence.