Monitoraggio di grandi frane riattivate e sospese nella valle del Fiume Secchia (Appennino settentrionale)

Large complex landslides of prehistoric age, that are coupling multiple roto-traslational rock slides at the crownto earth slides and earth flows in the intermediate and lower part of the slope, are widespread over the Northern Apenninesof Italy. Typically, these landslides alternate decades or centuries long dormancy periods, to shorter periods characterised bythe alternation between reactivation events and phases of suspended activity. This note deals with four landslides of thiskind, that have been repetitively reactivated in the last decade causing damages to key road connections in thesubcatchments of Secchia River. A comparative analysis of data from the four sites collected with monitoring systems suchas inclinometers, TDR cables, wire extensometers, GPS benchmarks networks and automated electric piezometers, has beencarried out. This has enabled the kinematics and hydrogeologic characteristics of the landslide during the suspended activityphases, and during the most recent reactivation phases, to be reconstructed. This has yield indications that can have ageneral validity for these type of mass movements.