Abstract
By analyzing the seismic catalogue of Iran, the probability distributions of interoccurrence times of earthquakes were investigated for different seismotectonic settings. Several probability distributions were applied to data from major seismotectonic provinces in different cut-off magnitudes and the distribution parameters were determined through the method of maximum likelihood. With the help of goodness-of-fit tests (AIC and BIC criteria based on information theory, Kolmogorov–Smirnov test) and the coefficient of determination, we have found that the gamma statistics and generalized normal statistics coexist in interoccurrence time statistics. Our results imply that a transition from a generalized normal regime to a gamma regime occurs if the threshold magnitude in certain seismotectonic regions (Alborz–Azarbayejan, Zagros, and Central-East Iran) is changed.
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