engleski

Identification of tectonically active areas using DEM : a quantitative morphometric analysis of Mt. Medvednica, NW Croatia

Mt. Medvednica is an inselberg in NW Croatia which lies at the intersection between Southeastern Alps, Northwestern Dinarides and Tisza Mega-Unit of the Pannonian basin. Due to the Pliocene-Quaternary N-S directed shortening Mt.Medvednica experienced 1500-2000 m of differential uplift and now exposes pre-Neogene and Neogene tectonic and stratigraphic units that are surrounded by Pliocene-Quaternary sediments. This paper evaluates a set of quantitative morphometry methods used to identify tectonically active areas within this region characterized by low-rate active folding and faulting during the Pliocene-Quaternary. Our analysis employed extraction of hypsometric curves, calculation of hypsometric integral, asymmetry factor, and statistical parameters of longitudinal stream profiles along 36 drainage basins delineated from a 25-m resolution DEM of Mt. Medvednica area. Despite lithological heterogeneity of the study area, the morphometric parameters we obtain are good indicators for discriminating tectonically active from inactive areas. We interpret that the most tectonically active areas are located at the SW corner and in the central part of the Mt. Medvednica, where they are likely related to the North Medvednica Boundary Fault, and to the Kašina fault, respectively. The latter divides the range into distinct NE and SW morphological and structural areas.

DEM; hypsometry; asymmetry factor; longitudinal stream profiles; active tectonics; Mt. Medvednica

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