The Western slope of the Andes of Northern Chile is characterized by intense seismicity. The W Escarpment and Precordillera are formed by coarse-grained clastic and volcaniclastic formations. The area has been characterized by a long-term hyper-aridity (Atacama Desert) and its evolution has been characterized by canyon incision into Tertiary paleosurfaces and large slope instabilities. These occurred in the “interfluvial” sectors of the western escarpment and Precordillera, and along the canyon flanks. Landslides affecting the preserved paleosurfaces, dissected by the parallel drainage network, involve volumes of various cubic kilometres and control the drainage network. These mega landslides locally evolved in large rock avalanches. Landslides along the canyon flanks affect volumes generally up to 1 km3 and have been reincised. We present a landslide inventory in the area between Pisagua (19.4_ Chile) and Tacna (17.5_ Peru) to the NE of the Arica bend. Volume estimates and slope stability modelling have been completed to characterize the phenomena and the possible trigger mechanisms
Crosta, G., Frattini, P., Valbuzzi, E., Valagussa, A., Hermanns, R. (2014). Large slope instabilities in northern Chile: Inventory, characterization and possible triggers. In Landslide Science for a Safer Geoenvironment: Volume 3: Targeted Landslides (pp.175-181). Springer International Publishing [10.1007/978-3-319-04996-0_28].
Large slope instabilities in northern Chile: Inventory, characterization and possible triggers
CROSTA, GIOVANNI;FRATTINI, PAOLOSecondo
;VALBUZZI, ELENA;VALAGUSSA, ANDREAPenultimo
;
2014
Abstract
The Western slope of the Andes of Northern Chile is characterized by intense seismicity. The W Escarpment and Precordillera are formed by coarse-grained clastic and volcaniclastic formations. The area has been characterized by a long-term hyper-aridity (Atacama Desert) and its evolution has been characterized by canyon incision into Tertiary paleosurfaces and large slope instabilities. These occurred in the “interfluvial” sectors of the western escarpment and Precordillera, and along the canyon flanks. Landslides affecting the preserved paleosurfaces, dissected by the parallel drainage network, involve volumes of various cubic kilometres and control the drainage network. These mega landslides locally evolved in large rock avalanches. Landslides along the canyon flanks affect volumes generally up to 1 km3 and have been reincised. We present a landslide inventory in the area between Pisagua (19.4_ Chile) and Tacna (17.5_ Peru) to the NE of the Arica bend. Volume estimates and slope stability modelling have been completed to characterize the phenomena and the possible trigger mechanisms
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