Akademik Veri Yönetim Sistemi
FRONTIERS IN EARTH SCIENCE, cilt.14, sa.1804337, ss.1-18, 2026 (SCI-Expanded, Scopus)
The right-lateral Hasan Timur Lake Fault (HTLF), located approximately 40 km east of Lake Van, remains geomorphologically under characterized despite its influence on regional drainage and landscape evolution. The study area represents an active morphotectonic setting developed under strike-slip fault control, characterized by segment-scale morphological differentiation and a drainage network organized parallel to the fault trace. This study evaluates along-strike variability in surface responses using a multi-index morphometric framework. A 30 m digital elevation model (DEM) was analyzed through a GIS-based workflow implemented in ArcGIS Pro and integrated with MATLAB/TecDEM to derive key geomorphic indices, including the stream length–gradient index (SL), mountain-front sinuosity (Smf), valley floor width-to height ratio (Vf), hypsometric integral and curves (HI–HE), and basin asymmetry factor (AF), for 78 fault-influenced micro-basins. The morphometric results reveal systematic spatial variations in basin geometry and drainage organization along the fault. S-shaped hypsometric curves characterize an intermediate stage of landscape development, reflecting the coupled effects of tectonic perturbation and fluvial erosion. In contrast, the concentration of convex hypsometric curves adjacent to the fault trace particularly in the southeastern sector indicates enhanced incision and geomorphic rejuvenation. Basin asymmetry patterns show a prevailing downstream leftward tilting in the northwestern and southeastern sectors, with localized rightward deviations in the central sector, suggesting spatially variable deformation reflected in basin-scale surface morphology. SL values in the southeastern sector, together with low Smf values and predominantly low Vf ratios, indicate steeper gradients, narrow valley floors, and straighter mountain fronts, collectively pointing to stronger geomorphic disequilibrium in this sector. These observations identify the southeastern segment of the HTLF as the most dynamically evolving part of the landscape.