ABSTRACT
Persistent Scatterers Interferometry (PSI) and satellite radar imagery can be used to detect very slow displacements of targets exhibiting coherent radar backscattering properties. Space-borne synthetic aperture radars are active microwave systems capable of recording coherently the electromagnetic signal backscattered from the Earth surface. In general, the activity of landslides in the Daunia Apennines is characterized by seasonal remobilisations of slope movements, typically related to rainfall events. Individual meteoric events have been the most frequent triggers of landslides, even though the mean annual rainfall is modest. The PSI results indicate that the majority of Permanent Scatterers (PS) in Casalnuovo Monterotaro are stable; these PS are concentrated within the historical centre of the town. In the case of Pietramontecorvino the deformations detected by PSI are present not only at the town’s peripheries, but also in the centre. Indeed, this town is known for the presence of instability problems affecting many buildings.
