Coastal cliffs are subject to continuous erosion leading to huge morphological changes; their monitoring is therefore essential when they are in proximity of human infrastructures or densely inhabited regions as these changes could be responsible for severe infrastructural damages and pose human lives at risk. In this work, using PSInSAR we explored the time-series of coastal displacements at Torre a Mare, Apulia, Southern Italy. We developed a fully automated early-warning system based upon an unsupervised classification which analyzes terrain movements, outline anomalous patterns and detect possible regions at risk.