A uniform earthquake catalogue is an essential tool in any seismic hazard analysis. In this study a seismic catalogue of Iran and adjacent areas was compiled, using international and national databanks. The following priorities were applied in selecting magnitude and earthquake location: a) local catalogues were given higher priority for establishing the location of an earthquake; and b) global catalogues were preferred for determining earthquake magnitudes. Earthquakes that have occurred within an area 23-42°N and 42-65°E, with magnitude range M W 3.5-7.9, from the 3 rd millennium BC until April 2010 were included. In an effort to avoid the 'boundary effect', since the newly compiled catalogue will be mainly used for seismic hazard assessment, the study area includes the areas adjacent to Iran. The standardization of the catalogue in terms of magnitude was achieved by the conversion of all types of magnitude into moment magnitude, M W .In the newly compiled catalogue all aftershock and foreshocks were disregarded, based on the procedure described by Gardner and Knopoff (1974). The magnitude of completeness for the three main tectonic seismic zones of Iran, i.e. the Zagros Mountain Range, the Alborz Mountain Range, and Central Iran, was established for the entire time span of the catalogue. The most recent period, 2000 to 2010, was studied in more detail. The seismicity parameters were calculated for each of the three main seismogenic zones.

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