NDLI: Landslide types and their relationships with weathering in a Calabrian basin, southern Italy

Content Provider	Springer Nature Link
Author	Calcaterra, Domenico Parise, Mario
Copyright Year	2005
Abstract	The basin of the Alaco River, in the Serre Massif of Calabria (Italy), is characterized by outcropping Palaeozoic granitoid rocks. The complex neotectonic history of the area and adverse climatic conditions, both active at least since the Quaternary, resulted in deep weathering of the crystalline rocks. Field observations, integrated with laboratory and in situ tests, allowed the weathering profile to be defined following the six-fold scheme proposed by the Hong Kong Geotechnical Control Office. The weathered rocks evidence a wide variety of mass movements, which were mapped over the entire basin. Debris flow-type instabilities dominate in the residual and saprolitic soils, while falls and slides are more significant in the less weathered rocks. In view of the complex vertical and lateral weathering in the rock mass and the high to very high overall susceptibility of the outcropping rocks to landsliding, it is difficult to postulate any direct relationships between individual types of mass movement and weathering grade.Le bassin versant de la rivière Alaco, dans la chaîne montagneuse de Calabre (Italie), est caractérisé par des roches granitiques du Paléozoïque, à l’affleurement. L’histoire néotectonique complexe de cette région et des conditions climatiques sévères, au cours de tout le Quaternaire, ont eu pour conséquence une profonde altération de ces roches. Des observations de terrain et des essais au laboratoire et in situ ont permis de classer les profils d’altération en utilisant la méthodologie proposée par l’Office géotechnique de contrôle de Hong Kong. Les roches altérées témoignent d’une grande variété de mouvements de terrain, qui ont été cartographiés sur l’ensemble du bassin versant. Les instabilités de type «debris flow» prédominent dans les sols résiduels et les roches très altérées, tandis que les chutes de blocs et les glissements sont associés aux roches moins altérées. Considérant la variabilité verticale et latérale des profils d’altération dans les masses rocheuses et la forte à très forte susceptibilité au glissement des roches à l’affleurement, il est difficile d’identifier une relation directe entre des types de mouvements de terrain et des degrés d’altération.
Starting Page	193
Ending Page	207
Page Count	15
File Format	PDF
ISSN	14359529
Journal	Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur
Volume Number	64
Issue Number	2
e-ISSN	14359537
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-03-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Glissements de terrain Aléa Altération Roches granitiques Calabre Italie
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology

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