Abstract: The Eastern Pontides, which is the under transpressional deformation zone, is an active mountain beltin northern Turkey that has been uplifting at a rate of more than 0.5 mm/year, along with push-up geometry. Thisuplift is accommodated by the dip/oblique slip normal fault segments of an en-echelon geometry mountain frontmapped here for the first time. According to our geological mapping studies, the Southeast Black Sea Fault zoneis about 65 km total long and more than 1 km wide and comprises nine fault segments. In the kinematic analysisconducted along the fault zone, fault planes have dip angles between 60o-90o to the north. The measured fault planeshave rake angles range from 32o to 90o. Our findings indicate that (i) the faulting observed in the mountain frontof the Eastern Pontides, the crustal thickness has increased due to thrust component strike-slip faults formed in acompressive regime where σ1 was horizontal at the initially, as a result of this, σ1 which is the horizontal positionwent in a vertical position, and lastly the former weakness zones were re-activated as normal faults, (ii) thisweakness is defined as an Southeast Black Sea Fault that produces earthquakes have resulted in surface rupture inthe Quaternary and therefore this fault should be considered in the class of "Quaternary Fault" in Turkey’s activefault maps.