A large landslide (affecting a total area of about 3.0×105 m2) occurred on December 3, 2013, SW of Montescaglioso, a town located in the Matera Province of southern Italy. The slope movement was registered in a setting characterized by widespread development of landslides of different typologies, and showing different states and styles of activity. In particular, the slope affected by the new landslide is characterized by several morphologies related to ancient gravitational movements, as also reported in previous works and maps, including the official geological map produced during the 1950's. The re-activation occurred after 56 hours of continuous rainfall, from 30 November to 2 December, with a cumulated rainfall measured at a rain gauge located 8 km from Montescaglioso of 151.6 mm, and mean rainfall intensity equal to 2.7 mm?h-1. It has to be noted that two months before the landslide event, between 5 and 8 October 2013, the general area between Apulia and Basilicata, including the town of Montescaglioso, was struck by a heavy rainfall event (cumulated rainfall = 246 mm, mean rainfall intensity = 3.6 mm?h-1), that caused widespread flooding, numerous shallow landslides, severe economic losses, and four fatalities. The December 2013 landslide damaged the freeway connecting the town of Montescaglioso to the Province road SP175, disrupting more than 500 m of the road; further, it involved a few warehouses, a supermarket, and private homes. Immediately after the landslide event, we performed field surveys to evaluate the main consequences of the landslide, and to compile a map of the surface deformation in the landslide area, following a methodology already used in several other cases in the past. The field surveys were aided by the visual analysis of post-event terrestrial photographs, and photographs taken during helicopter flights. The geomorphological features mapped in the field and through the inspection of the terrestrial and the helicopter photographs included single fractures, sets of fractures, tension cracks, trenches up to 6 m in depth/width, and pressure ridges. Many of the geomorphological features mapped immediately after the landslide event were later destroyed by the construction of temporary roads. In this paper we present the methodology used, the map obtained through the intensive field work, and discuss the main features of deformation produced by the landslide at the surface.
Mapping surface features produced by an active landslide
PARISE M;GUEGUEN E;VENNARI C
2016
Abstract
A large landslide (affecting a total area of about 3.0×105 m2) occurred on December 3, 2013, SW of Montescaglioso, a town located in the Matera Province of southern Italy. The slope movement was registered in a setting characterized by widespread development of landslides of different typologies, and showing different states and styles of activity. In particular, the slope affected by the new landslide is characterized by several morphologies related to ancient gravitational movements, as also reported in previous works and maps, including the official geological map produced during the 1950's. The re-activation occurred after 56 hours of continuous rainfall, from 30 November to 2 December, with a cumulated rainfall measured at a rain gauge located 8 km from Montescaglioso of 151.6 mm, and mean rainfall intensity equal to 2.7 mm?h-1. It has to be noted that two months before the landslide event, between 5 and 8 October 2013, the general area between Apulia and Basilicata, including the town of Montescaglioso, was struck by a heavy rainfall event (cumulated rainfall = 246 mm, mean rainfall intensity = 3.6 mm?h-1), that caused widespread flooding, numerous shallow landslides, severe economic losses, and four fatalities. The December 2013 landslide damaged the freeway connecting the town of Montescaglioso to the Province road SP175, disrupting more than 500 m of the road; further, it involved a few warehouses, a supermarket, and private homes. Immediately after the landslide event, we performed field surveys to evaluate the main consequences of the landslide, and to compile a map of the surface deformation in the landslide area, following a methodology already used in several other cases in the past. The field surveys were aided by the visual analysis of post-event terrestrial photographs, and photographs taken during helicopter flights. The geomorphological features mapped in the field and through the inspection of the terrestrial and the helicopter photographs included single fractures, sets of fractures, tension cracks, trenches up to 6 m in depth/width, and pressure ridges. Many of the geomorphological features mapped immediately after the landslide event were later destroyed by the construction of temporary roads. In this paper we present the methodology used, the map obtained through the intensive field work, and discuss the main features of deformation produced by the landslide at the surface.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
