LOS Ground Displacement Monitoring in Northeast Tunisia Using SBAS InSAR

The Lebna watershed in northeast Tunisia is marked by its important agricultural activities and its hydro-geological settings, enhancing its susceptibility to various geohazards including land subsidence and uplift. This study monitors the Line of Sight (LOS) deformation through the Interferometric Synthetic Aperture Radar (InSAR) technique. The main observations are LOS velocity maps derived from the Small Baseline Subset - InSAR, which were calculated from ESA Sentinel-1 satellites for the period 2015–2023. The SAR data resulted in velocities ranging between $$-1.05$$ and $$+0.80$$ cm/year. Both subsidence and uplifting trends were observed in different areas, indicating that the ground deformations in the study region could be dependent on geological and hydrogeological factors.