Some remarks on the recent conditions related to the development and prognosis of sliding movements in the flyschoid rocks of the West Carpathians

Abstract

Recent natural conditions of central Europe give rise to sliding movements mostly due to the revival of older deformations. Spontaneous origin of deformations on undisturbed slopes in the absence of human activity is rare. In the Flysch area of the West Carpathians the tendency to the onset of landslides exists in the talus masses of hills and depressions, mostly on slopes inclined 7 to 15 degrees. With this the combination of hydrogeological and morphological conditions is most favourable for the development of failures. Natural origin of landslides in this case occurs mostly in the presence of extreme precipitation of the order of 250 to 300% of the average values and in the non-vegetation period, i.e. from October to March.