Czynniki uaktywniające i zróżnicowanie czasowe przemieszczeń koluwiów w różnych częściach stoku osuwiskowego - analiza dendrochronologiczna na przykładzie osuwiska Skalka (Moravskoslezské Beskydy)

Abstract

The aim of the study was to determine the temporal variability o landsliding and differences in the activity of individual part of a small land-slide. Dendrochronological methods have been applied: tree-ring eccentricity was analysed for 60 Norway spruce trees. The most dynamic landsliding occurred in: 1975, 1993, 1985, 1968–1969 and 1995. The number of wood-growth disturbances recording landsliding in particular years matches well with precipitation totals for summer half-years (e.g. landsliding and precipitation in: 1968, 1972, 1975, 1977, 1985, 2010) and to the smaller degree with totals for winter half-years (e.g. 1961). Results indicate uneven activity of particular landslide sections. The movement in particular parts of the landslide is triggered during various precipitation events or due to other factors (e.g. 1992–1993 earthquakes with epicentres in Beskid Sądecki Mts).