In this study, by relocating earthquakes and determining their focal mechanism using all available data, we investigated seismicity, determined active faults and seismic sources, and matched these trends with existing fault maps and tectonic boundaries. We relocated 8 seismic clusters containing 1351 earthquakes using the hypocentroid decomposition method. Our results show that most of the seismicity is concentrated on the North Tabriz fault, the Gailatu–Siah Cheshmeh–Khoy fault and the Chalderan fault system which in the previous studies as tectonic boundaries have been introduced. Our results show a concentrated trends of seismicity from Zagros towards Salmas and southeast Anatolia and on the Garmachay fault. However, there are trends perpendicular to the North Tabriz fault, West Khoy and Lake Van, which are not in line with the trends of the known faults. Also, in past studies, a fault has been introduced in the west of Salmas, and our results do not show seismicity on it.