STATISTICALANALYSIS OF THE INTER-EVENT TIME AND DISTANCE DISTRIBUTION OF LARGE EARTHQUAKES IN IRAN

In this study, the waiting time, migrating distance, and directional trend pattern of successive large earthquakes in Iran have been investigated. In order to carry out this work, the earthquake data of Iran with M ≥ 4.5 (1976-2018) have been obtained from the USGS catalog. Then, the statistical distribution of the Inter-event time, migrating distance, and directional trend of migration of successive events were studied using different lower magnitude thresholds. Additionally, the statistical and probability distributions of inter-event times of earthquakes distances were assessed and modelled by different distribution models. Furthermore, the directional analysis of migrating trends of successive events with different lower magnitude thresholds was carried out. The results obtained indicate a meaningful correlation between the directional pattern of the migrating trends of successive events and the dominant trends of the active faults of the region. In addition, it is observed that the inter-event time distribution of earthquakes can be quite well fitted by the Gamma distribution model.

Keywords:

Inter-event time distribution , Statistical distribution of earthquakes , Earthquake directional migration pattern , Seismicity , Seismotectonics