Monitoring of the Tessina landslide in the Italian Alps to improve prediction criteria

The Tessina landslide (North-Eastern Alps, Italy), first triggered in October 1960, is a complex movement featured by an upper source area of rotational slides turning into a mud flow that moves through a steep channel lapping the villages of Funes and Lamosano. Several mudflow reactivations occurred in the last 54 years, sometime creating risk conditions for the valley. After a particularly important event, a drainage tunnel was excavated in 1994 in the slope behind, to reduce the water infiltration in the sliding mass, and monitoring has carried out from 1995 to now using the new technologies developing. The study illustrates and discusses some outcomes of the monitoring carried out in the last years, to evaluate the interrelationship among the significant factors affecting the landslide evolution, especially in a lateral area, where the next collapse is expected to occur.