Ground Displacement Evaluation of the Ischia Island (Phlegraean Volcanic District, Italy) Applying Advanced Satellite SAR Interferometry Techniques

Synthetic Aperture RADAR data acquired during several space missions (Envisat, COSMO-SkyMed and Sentinel-1) were treated in order to obtain the ground displacement of the Ischia island (Naples, Italy) and to retrieve the deformation evolution during the investigated time period. The results, validated with available GPS measurements, were found by applying the Small Baseline Subset (SBAS) technique [1], one of the main algorithms proposed in the context of multitemporal methods of Differential SAR Interferometry. This technique permitted to identify and monitor areas affected by slope instability phenomena in a quite continuous time period, from 2002 to the end of 2019. The presented results constitute the basic information for the future application of a GIS-based interdisciplinary approach aimed at the prevention of natural disasters in correspondence with the Ischia island.