Geomorphological analysis of the historic landslide of Sottrù (Badia Valley, Italy) reactivated on December 13, 2012.

Ghinoi, A., Freddi, R., Pasuto, A., Soldati, M., 2014, Geomorphological analysis of the historic landslide of Sottrù (Badia Valley, Italy) reactivated on December 13, 2012., Analysis and Management of Changing Risks for Natural Hazards, Padova, 18-19 novembre 2014,
URL: http://www.cnr.it/prodotto/i/341326

The Sottrù landslide, located in the Upper Badia Valley (Dolomites, Italy), is a historic landslide that reactivated in December 2012, destroying a few houses, cutting two roads and almost damming the Gadera torrent. The previous known event dates back to June 1821, which took place after persistent rainfall and snow melting. What strikes the most is that the 2012 event occurred during an unusual season for landslides in the study area, while its spatial extent appears to be quite similar to that of the 1821 event. During summer 2014, a detailed geomorphological survey has been performed, aiming at identifying the instability causes, mapping the landslide in detail and investigating the hydrological and hydrogeological characteristics of the slope, within a wider geomorphological framework, comprehensive of the surrounding slopes. The survey, integrated with the analysis and comparison of pre- and post-2012-event morphological features and with the analysis of local meteorological time series, has led to a preliminary interpretation of the movement type and style of activity and to define the role of sub-surface drainage in the sliding process. Possible triggering mechanisms have been investigated.

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