Browsing by Author "Kul, Ahmet Ozkan"

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Long-Term Slip Rate Estimation for Ercis Fault in East Anatolian Compressive Tectonic Block From Geologic and Geomorphologic Field Evidence
(Wiley, 2021) Selcuk, Azad Saglam; Kul, Ahmet Ozkan
The Ercis Fault, which bounds the northern part of the Lake Van Basin, is approximately 50 km long with right-lateral strike-slip movement in a N30-50 degrees W direction. The Ercis Fault starts in the northwest, south of Girekol Volcano, and extends to the Turkey-Iran border, and together with the caldiran Fault forms the tectonic boundary between the Turkey-Iran Block and Lesser Caucasus-Talesh Block. Offset riverbeds, fault-controlled drainage systems, deformed alluvial fans along the faults, Plio-Quaternary volcanics, and volcanic structures are geomorphic and tectonic features that show that the Ercis Fault is active in the region. This fault has played an active role in the deformation of the Eastern Anatolian Plateau, which developed as a result of collision of the Arabian and Eurasian plates. In this study, the role of the Ercis Fault in the tectonic evolution of the region was investigated using geologic, geomorphologic, and remote sensing analysis methods. According to the morphometric indices used in the study, values of 1 < Smf < 2.1, 0.2 < Vf < 3.29, 0.3 < HI < 0.5, 25 < SL < 850 and 100 < Ksn < 600 were obtained. Results show that the area has an extremely young topography and is actively uplifting. It has been determined that the uplift rate in the region has increased in the northwest and south-east compared to other areas and is more than 0.5 mm yr(-1). According to the remote sensing and field studies, an approximately 850 m right-lateral offset is observed in the Delicay River, which is cut by the Ercis Fault, and that the long-term slip rate of the Ercis Fault is 2.02 +/- 0.12 mm yr(-1).
Tectonic Geomorphology of the Hoyran Graben (Western Anatolia, Türkiye): Insights From Geomorphic Indices
(Polish Geological inst, 2024) Cetin, Yaren Sena; Agar, Hasan Salih; Kahraman, Burcu; Bayram, Levent; Kul, Ahmet Ozkan; Ozsayin, Erman; Uner, Serkan
The area be tween West ern Anatolia and Isparta Bend com prises nu mer ous de pres sions and the ac tive faults that bound them. The Hoyran Graben is one of these de pres sions, lo cated at the north ern most part of the Isparta Bend. This NE-SW-ori ented graben is bounded by the Hoyran Fault in the north west and the Uluborlu, Senirkent and Kumdanli faults in the south-east, re spec tively. We eval u ate the seis mic ac tiv ity po ten tial among seg ments of the bound ary faults in the light of field work and morphometric in di ces. These bound ary faults of the Hoyran Graben are di vided into twelve seg ments for the analysis, with indices used including mountain-front sinuosity (Smf: 1.05-2.02), val ley floor width-to-val ley height ra tio (Vf: 0.11-1.34), hypsometric curve and in te gral (Hi: 0.4-0.73), asymmetry factor (Af: 13.76-87.03), stream length-gra di ent (SL: 1.48-9450) and nor mal ized chan nel steep ness (Ksn: 2.38-990.38). The re sults ob tained, to gether with field ob ser va tions, in di cate that the Uluborlu, Senirkent and Kumdanli faults, as well as the west ern seg ments of the Hoyran Fault, rep re sent higher po ten tial in terms of seis mic ac tiv ity with up lift rates >0.5 mm/y, while the cen tral and east ern seg ments show mod erate ac tiv ity with up lift rates be tween 0.05 and 0.5 mm/y. Thus, the bound ary faults of the Hoyran Graben need fur ther at ten tion in terms of re gional seis mic haz ard.