La deformazione gravitativa profonda (DSGM) del versante orientale del Monte Amiata: un geosito ed un itinerario geomorfologico in Toscana meridionale.

We illustrate the main geomorphological characteristics of the eastern slopes of Mount Amiata, affected by a series of Gravitational Slope Deformations (DSGM). The DSGM S. Piero and Podere Mezzavia develop on marls and marly limestone “Ligurian” terrains and partially on Pliocene clays. The Abbadia San Salvatore DSGM, that hosts the homonymous town as well as the town of Piancastagnaio, sits on volcanic & ' " "*" * ""* "*' movement at depth where, however, it seems likely that the entire mass has not developed a continuous sliding surface. High precision GPS measurements indicate that large sectors of the S. Piero and Podere Mezzavia DSGM are affected by active movements that created fractures and deformations of buildings and artefacts. The largest Abbadia S. Salvatore DSGM is apparently quiescent. We suggest a preliminary itinerary aimed to illustrate the main geomorphological characteristics of this very large landslide area. The itinerary starts from the summit of the Mt Amiata and the adjacent slopes not affected by gravitational ' % % +/ Abbadia S. Salvatore DSGM. The itinerary later reaches the main evidence on the road and buildings down to the distal part of the movements.