The study area contains an area of about 80 km2  including a part of the Lake Hazar basin along the East Anatolian Fault Zone in the vicinity of Sivrice (Elazig). The units in this area consist of magmatic, sedimentary and volcano-sedimentary rocks in age ranged from Jurassic to Middle Eocene and generally showed tectonic relations to each others belonging to Paleotectonic period, and alluvial terrace, alluvial fan, fan delta and lacustrine deposits, which have deposited in a fault-controlled strike-slip basin, belonging to Neotectonic period.

            EAFZ, 580 km length, cutting through the study area is a left-lateral strike-slip fault system. Fault zone contains together with a main displacement fault, a number of subordinate fault branches parallel and sub parallel to this fault, and branched off and joined  again to this one. The southeastern border of Lake Hazar basin located in the fault zone is controlled with these fault branches. Because of tensional tectonic regime activated in the southeastern block of the fault zone, fault branches have gained distinct dip-slip components. In this way, the northern slope of Hazarbaba Mountain displays a step-like morphology. Because of this, the active depression of Hazar Lake exhibits a half-graben characteristic.

Key Words: East Anatolian Fault Zone, Hazar Lake, Strike-slip fault system