The Eastern Pontides (EP), which is the under transpressional deformation zone, is an active mountain belt that has been rising rapidly since the Cenozoic era because of the Arabian-Eurasian convergence. Morphometric studies have been performed to investigate the tectonic activity of this region and better understand the characteristics of the faults geomorphologically; the faults control the mountain fronts in the drainage basin of the EP. The results show the Hypsometric Curve (HC)-Hypsometric Integral (0.37-HI-0.67), Basin-Shaped Analysis (1.2-B_s-7), Valley-Floor-Width to Height-Ratio (0.4-V_f-1.2) and Asymmetry Factor (35-AF-81) applied to 46 drainage basins together with 9 tectonically controlled geomorphic indices (1.2-S_mf-1.5) and a Stream Length Gradient (30-S_L-120) indicate that the EP is tectonically active, and when the areas are evaluated according to S_mf and V_f analyses, the tectonic level is relatively high. According to our conceptual model for the uplifting of the EP, with respect to field studies and morphometric analysis, (i) the EP is the active deformation zone and has a “push-up” geometry in conjunction with the North Anatolian Fault; (ii) the EP is progressively uplifting at a rate of more than 0.5 mm/yr in along with the thrust faults of the Black Sea Fault (BSF) and Borjomi-Kazbegi Fault (BKF).

The Edremit Fault Zone (EFZ) forms one of the southern segments of the North Anatolian Fault Zone (NAFZ) at the northern margin of the Edremit Gulf (Biga Peninsula, South Marmara Region, Turkey). Stratigraphic, structural and kinematic results indicate that basinward younging of the fault zone, in terms of a rolling-hinge mechanism, has resulted in at least three discrete Miocene to Holocene deformational phases: the oldest one (Phase 1) directly related to the inactive Kazdağ Detachment Fault, which was formed under N–S trending pure extension; Phase 2 is characterised by a strike-slip stress condition, probably related to the progression of the NAFZ towards the Edremit area in the Plio–Quaternary; and Phase 3 is represented by the high-angle normal faulting, which is directly interrelated with the last movement of the EFZ. Our palaeoseismic studies on the EFZ revealed the occurrence of three past surface rupture events; the first one occurred before 13178 BC, a penultimate event that may correspond to either the 160 AD or 253 AD historical earthquakes, and the youngest one can be associated with the 6 October 1944 earthquake (M_w = 6.8). These palaeoseismic data indicate that there is no systematic earthquake recurrence period on the EFZ.

Bu çalışmada, Doğu Anadolu Fay Zonu (DAFZ) güney kolunu oluşturan parçalarda 6 Şubat 2023 tarihinde meydana gelen Mw=7.7 büyüklüğündeki Pazarcık (Kahramanmaraş) depremine bağlı olarak gelişen yüzey kırıklarının, 1/25.000 ölçeğinde haritalanarak belirlenen morfolojisi ve atım miktarları esas alınarak bölgesel ölçekte değerlendirilmesi amaçlanmıştır. Yüzey kırığı üzerinde gerçekleştirilen çalışmalarda, Çelikhan’da 2.90 m olarak ölçülen sol yanal yer değiştirmenin Gölbaşı/Balkar’a doğru 3.80 m’ye ulaştığı, ana şokun olduğu yere yaklaşıldıkça da arttığı görülmektedir. Çelikhan’da dar bir deformasyon zonu geliştiren yüzey kırığı, Gölbaşı/Balkar mevkiine doğru sola sıçrama yaparak genişlemeli bir deformasyon zonu oluşturmaktadır. Bu duruma bağlı olarak 60 cm’ye varan düşey atımların da ölçüldüğü söz konusu alanda küçük ölçekli çek-ayır havzaların geliştiği gözlenmiştir.