Abstract

From the geostructural point of view, the territory of Tolve town is situated between the Southern Apennine chain, which is an imbricate thrust belt, and the Bradanic Trough. The lithological units are represented by Varicoloured Clays, by some flysch of Oligocene-Miocene age and by Pliocene deposits made up by conglomerates, yellow sands and blue-grey Clays. A geomorphological study, at different scales, of the gravitational slope deformations in a large part of the territory has been carried out. There are complicated "lands tide-in-landslide" systems, where the large deformations include and control the smaller ones. The numerous deformations of the Monte Moltone slopes are framed into a more general mechanism of loading of its nucleus and of lateral spreading towards the valleys. The tectonic tilting and uplifting, generated by the abovementioned imbricate structure, have primed large tectonic decollements, which are going on as gravitational slidings. A geomorphological and geotechnical study in a test-site, supported by instrumental measurements into the boreholes points out that the large landslides in the Pliocene clays are very slow and progressive. Stability analysis show that the landslide bodies are in-stable or close to instability conditions with an average slope angle of 8 degrees .

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