This paper is focused on a landslide occurred the 10th April, 2015 in Northern Sicily (Southern Italy), involving the lower portion of a slope on the left bank of the Imera River. The landslide had a great impact for the transportation network, as it produced the collapse of the Imera viaduct (Catania-Palermo Highway - A19) and it severely damaged an important connection road (SP24). After the landslide event, a monitoring plan aimed to ensure the safety conditions during the work for the restoration of the viability has been developed. Among the activities, a continuous monitoring with Terrestrial SAR Interferometry (TInSAR) technique has been performed with the following purposes: i) control the deformational behavior of the slope, particularly in correspondence of main structures and ii) provide an alert system for the operation of the remaining viaduct. In addition, in this paper we present the pre-failure deformations analysis of the slope retrieved by A-DInSAR (Advanced Differential Synthetic Aperture Radar Interferometry) technique, exploiting a dataset of COSMO-SkyMed images collected between 2013 and 2015. The 2015 landslide developed in flysch deposits predominantly composed of clay materials. It has been classified as a composite landslide, triggered by heavy rainfall. The Satellite and Terrestrial InSAR analyses have allowed us to characterize the deformational behavior of the slope before and after the failure occurrence, highlighting the activity of the slope affected by the Scillato landslide.
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