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- MakaleYalnız künye2025Scopus SJRQ2Morphometric constraints on tectonic activity and landscape evolution in the Uludağ Range, NW Türkiye
Sançar, Taylan; Karabacak, Volkan
The Uluda & gbreve; Range of northwest T & uuml;rkiye forms a key tectonic boundary between the North Anatolian Fault Zone and the Western Anatolia Extensional Region, where active deformation is expressed across a network of strike-slip and normal faults. To investigate how fault segmentation and kinematics control landscape evolution in this complex orogen, we integrate high-resolution morphometric analysis with paleoseismological data. We extracted key morphometric indices-including Delta-relief, Delta-elevation, Delta-gradient, Delta chi, hypsometric integral, channel concavity (m/n), normalized channel steepness (ksn), and knickpoint distribution-from 10-meter DEMs using open-source geomorphic toolkits. Our results demonstrate pronounced spatial variability in geomorphic signatures and tectonic activity across four divide segments (DS). DS01, associated with the right-lateral Ulubat Fault, exhibits exceptional morphometric stability and minimal disequilibrium, in line with long earthquake recurrence intervals and low Holocene slip rates. In contrast, DS02 and DS03-bounded by the Bursa and So & gbreve;ukpinar faults-display chi-based divide migration and subtle landscape adjustment. DS04, influenced by the & Idot;neg & ouml;l and Oylat faults, is characterized by elevated channel steepness, dense knickpoint clustering, and southward divide migration, collectively indicating ongoing uplift and transient drainage adjustment. The strong correspondence between morphometric disequilibrium and documented earthquake recurrence patterns highlights the critical value of integrating geomorphic and paleoseismological datasets. Our findings demonstrate that only through the convergence and cross-validation of multiple independent metrics can the segmented imprint of active deformation be reliably detected-particularly where landscape response is temporally offset from fault activity. The methodological framework developed here provides a robust template for quantifying active structures and their geomorphic consequences and can be widely applied to other tectonically complex mountain belts for seismic hazard assessment and landscape evolution studies.
AtıfWoS2OpenAlex2
İncele - MakaleAçık Erişim2018Investigation of Uplift Rate History of the Yuksekova Basin (Southeast Turkey)
Sançar, Taylan
The 90 km long and N50 degrees-60 degrees W oriented right lateral Semdinli Yuksekova Fault Zone (SYFZ) is located at the southeast of the EACP. The most prominent morphotectonic structure of the SYFZ is the Yuksekova Basin that has a long axis striking in NW-SE direction with a length of 38 km and the maximum width of 10 km. In this study, morphometric indices were used to investigate the uplift characteristics of the basin. According to the Mountainfront sinuosity (S-mf) and the ratio of valley-floor width to valley-height index (V-f) calculations along the mountain fronts on the northern and southern margins of the Yuksekova Basin, the faults that delimit the basin margins have high activity, and the uplift rate is not less than 0.5 mm /yr. Spatial distribution of the m/n values of the drainage areas reveals that the SYFZ have driven the rock uplift around the basin rather than the large-scale lithospheric processes. The integral analysis (chi=chi) of the tributaries in the drainage areas located close to the faults that delimit the Yuksekova Basin indicate that the uplift rate of the basin changes over time regardless of the m/n ratio. The integral analyses of lithological units, which are resistant to erosion around the basin, reveal that uplift rate has been changed four times.
AtıfWoS3OpenAlex5İncele