247. Morphological and Climatic Aspects of the Initiation of the San Mango Sul Calore Debris Avalanche in Southern Italy

On the 10th November 2010 a high-velocity landslide occurred in the San Mango sul Calore municipality (Southern Italy). The event triggered from the North facing side of the Tuoro Mt. after a rainstorm, involved the pyroclastic and colluvial materials that covered part of the hill-slope. The debris avalanche destroyed an occupied house and damaged several service lines. Field surveys shown that it affected only the deforested part of the slope and its source area was located downslope a man-made cut. We analyzed rainfall data of the climatic station located about 1 km far from the debris avalanche at about 600 m above the sea level. The landslide occurred after about 63 h of rainfall, after the rainstorm. The cumulative rain recorded during the 3 days storm was about 235 mm and the alert threshold of the rainstorm hazard index, has been exceeded.