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The Qotur doublet-earthquakes with magnitudes MN 5.7 and 5.9 occurred on 23 February 2020 in west Azarbaijan province near the Iran-Turkey border and was followed by many aftershocks. In this study the Qotur aftershocks sequence were relocated, by using the double-difference relocation method (HypoDD). The integrated data from Iranian Seismological Centre (IRSC) and Disaster and Emergency Management Presidency of Turkey (AFAD) catalogues were used. The aftershocks distribution indicates a seismic zone covering an area of approximately 15 × 10 km2 and oriented NE–SW. Depth distribution of aftershocks in the cross sections show that the focal depths decrease toward the S-SE part of the region and deeper-aftershocks are located in the N-NW part. The result presents that the dominant depth range of aftershocks is from ~ 3 to ~ 15 km. This observation suggests that the causative fault(s) of the Qotur doublet-earthquakes with striking along the northeast–southwest dip toward northwest. Probably, the Başkale fault zone is the causative fault for the Qotur doublet earthquakes. [ABSTRACT FROM AUTHOR]