| Abstract: | The Conturrana rockslide-debris flow involved a mass of almost 22 × 106 m3 of well indurated breccia with a plastic basal layer. The original rock mass slid initially along a listric slip surface — which required the rupture of the mass itself by internal shearing and caused the formation of a horst-and-graben morphology — and attained a high speed. Then part of the mass fell from a morphological step, and moved about 800 m forward. In this landslide, the morphological and morphometrical examination — which is also based on a reconstruction of the pre-landslide topography — indicates that mobility was rather low when related to volume and to the control exerted by local morphology. The event might have been induced by an earthquake in the 4th century. |
