Abstract

The south-eastern slope of the Nocara ridge, located in the Southern Apennines at the boundary between Calabria and Basilicata, is affected by an ancient and large landslide on which the village of Canna is located. The landslide deposits invade the Canna river and force it to move eastwards. Three main morphodynamic phases, which have brought the slope to its present configuration, have been suggested; they are termed T <sub>1</sub> , T <sub>2</sub> and T <sub>3</sub> . At first, the slope movements (T <sub>1</sub> phase) had affected the highest areas of the relief, with topples and falls; these areas are made up of conglomerates belonging to the Nocara Unit. Successively, in T <sub>2</sub> phase, retrogressive slope movements with flows and slides were triggered by the Canna river erosion. These first affected the lower part of the slope, made up of the lithologic associations of the Argille Variegate Fm. and subsequently developed upwards affecting part of the deposits of the T <sub>1</sub> phase. The last and present phase (T <sub>3</sub> ), characterized by earth flow phenomena, affects the foot of the ancient landslide and it is due to undermining of the Canna river, and to severe and continuous rainfall. All this induces us to think that the slope has not been stabilized.

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