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    Wyświetlanie 1-3 z 3
    Tytuł:
    Identification of tectonically active areas using DEM : a quantitative morphometric analysis of Mt. Medvednica, NW Croatia
    Autorzy:
    Matoš, B.
    Tomljenović, B.
    Trenc, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059961.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Digital Elevation Models
    DEM
    hypsometry
    asymmetry factor
    longitudinal stream profiles
    active tectonics
    Mount Medvednica
    Opis:
    Mt. Medvednica is an inselberg in NW Croatia which tectonically 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 transpression it experienced a differential uplift between 1500-2000 m and exposes pre-Neogene and Neogene tectonic and stratigraphic units surrounded by Pliocene-Quaternary sediments. This paper evaluates a set of methods in quantitative morphometry, used here for identification of tectonically active areas within a region characterized by low-rate active folding and faulting during the Pliocene-Quaternary times. Analysis employed extraction of hypsometric curves, calculation of hypsometric integral, asymmetry factor, and statistical parameters of normalized longitudinal main stream profiles of 36 drainage basins delineated from a 25-m resolution DEM of Mt. Medvednica area. Despite lithological heterogeneity, obtained morphometric parameters are considered as fairly good indicators for discriminating tectonically active from inactive areas. Based on calculated parameters, in combination with geological data, the most tectonically active areas during the Quaternary are found at the SW corner of the Mt. Medvednica related to an active segment of the North Medvednica Boundary Fault, and in the central part of the mountain related to the Kašina fault zone subdividing mountain into the NE and SW units.
    Źródło:
    Geological Quarterly; 2014, 58, 1; 51--70
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the deep seated geological structures on the landscape morphology of the Dunajec River catchment area, Central Carpathians, Poland and Slovakia
    Autorzy:
    Wołosiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/100812.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Śląski. Wydział Nauk o Ziemi
    Tematy:
    morphotectonics
    morphometry
    DEM
    base-levels
    hypsometry
    Central Carpathians
    morfotektonika
    morfometria
    hipsometria
    Karpaty
    Opis:
    The area of the Dunajec river basin includes several geological units in the Central Carpathian region at the Polish-Slovakian borderland. The paper focuses on the geomorphometric parameters of the drainage system to recognize the influence of the deep seated geological structures on the morphology of the Dunajec river basin (Central Carpathians). The study were enriched with analysis of the geological maps and lineaments extracted from Digital Elevation Model. According to the obtained results, the massive NW-SE trending fault zones play a vital role in the geological architecture of the researched area. The development of the secondary fault structures has been determined by these dislocations and the manifestation of their activity can be observed as deformations of some of the other tectonic structures along the main fault zones, especially at the folds’ axes. Additionally, the geometric and morphometric features of the drainage system have also been influenced by the activity of these deep structures. The tectonic activity represented by the level of morphological rejuvenation, visible in the light of the morphometric parameters of the streams and the drainage basins, varies greatly between the tectonic units. This diversity is caused by both the lithological and structural features of these geological units.
    Źródło:
    Contemporary Trends in Geoscience; 2018, 7, 1; 21-47
    2299-8179
    Pojawia się w:
    Contemporary Trends in Geoscience
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geomatics-based assessment of the neotectonic landscape evolution along the tebessa-morsott-youkous collapsed basin, Algeria
    Autorzy:
    Taib, Hassan
    Benabbas, Chaouki
    Khiari, Abdelkader
    Hadji, Riheb
    Haythem, Dinar
    Powiązania:
    https://bibliotekanauki.pl/articles/2175183.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
    Tematy:
    tectonic activity
    hypsometry index
    sinuosity
    asymmetry
    topography
    aktywność tektoniczna
    wskaźnik hipsometryczny
    sinusoida
    asymetria
    topografia
    Opis:
    The neo-tectonic research is interested in the study of the movements of Earth’s crust in recent geological times. It could explain the deformation mechanisms that lead to the structuring of drainage catchments. The Morsott-Tebessa-Youkous (Chabro) collapsed basin corresponds to a subsiding depression framed by brittle structures and filled with thick deposits. Our work aims to unveil the neo-tectonic activity and reconstruct the morphometric evolution of the landscape and the drainage network of the basin. For this task, our investigation applies a quantitative analysis of geomorphic indices extracted from the DEM of the study area. We used a GIS-based approach to compile seven morphometric factors namely Integral Hypsometry (HI), the Sinuosity of mountain fronts (Smf), the Valley Floor width to height ratio (VF), the Asymmetry Factor (AF), Basin Shape index (BS), and the topography (T). All these thematic parameters were processed in a Geo-database to calculate the study area’s Relative Tectonic Activity Index (IRAT) as a result. The IRAT map was categorized into three classes. The result highlighted the distribution of relative tectonic activity in the region and unveiled some unknown faults. It associated the sinuosity of rivers and the deformation of the substratum with active tectonic anomalies. This research work succeeded in drawing up a new scheme of the neo-tectonic activity and morphostructural evolution in the collapsed basin.
    Źródło:
    Geomatics, Landmanagement and Landscape; 2022, 3; 131--146
    2300-1496
    Pojawia się w:
    Geomatics, Landmanagement and Landscape
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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