Osuwiska w masywie Granicznika w Górach Kamiennych
Journal Title: Przyroda Sudetów - Year 2017, Vol 20, Issue
Abstract
Landslides in the Granicznik massif in the Kamienne Mountains In the Granicznik massif (801 m a.s.l.) in the central part of the Kamienne Mts, Middle Sudetes, seven landslides were recognised, ranging in size from 1 to 5.4 ha. Some were mapped as early as the early 20th century during the first detailed geological mapping of the region, while others were identified only recently, after high-resolution LiDAR elevation data were made available. Most landslides occurred on steep north-facing slopes, where a thick trachyandesite unit of Permian age overlies deformable fine-grained sediments. The inventory of landforms due to landslides includes steep (up to >50°) head scarps up to 40–50 m high, gently sloping benches in the mid-slope, irregular hummocky terrain in the lower slope, occasionally with closed depressions, and steep toes. The rock outcrops within the head scarps are scarce, probably due to rapid disintegration of densely jointed trachyandesites which turned original rock faces into talus-covered steep slope segments. The mid-slope benches are interpreted as top surfaces of downthrown rigid blocks of volcanic rock which were subject to minor backward rotation, whereas the lower slope irregular terrain is likely to have resulted from deformation of sedimentary beds underneath the volcanics. The landslides in the Granicznik massif belong to smaller ones within the Kamienne Mts, but they very well illustrate the role played by the combination of geological and topographic factors in making an area susceptible to landsliding.
Authors and Affiliations
Kacper Jancewicz, Piotr Migoń
Keywords
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Osuwiska w masywie Granicznika w Górach Kamiennych
Landslides in the Granicznik massif in the Kamienne Mountains In the Granicznik massif (801 m a.s.l.) in the central part of the Kamienne Mts, Middle Sudetes, seven landslides were recognised, ranging in size from 1 to...