GNGTS 2021 - Atti del 39° Convegno Nazionale

GNGTS 2021 S essione 2.1 162 Figures 2C and 2D show the displacement rate in millimetres per year for Pescosolido and Pisciotta DGSDs, respectively. Negative LoS velocities, indicating ground movements away from the satellite sensor, were recorded for Pescosolido landslide, while positive LoS velocities, implying ground movements approaching the satellite sensor, were observed for the Pisciotta DGSD. Both the outcomes are consistent with the expected landslides kinematic. The deformation evolution over time is also shown for Pescosolido and Pisciotta landslides thanks to the detailed investigation carried out at the centre of both landslide masses (black triangle in Fig. 2C and 2D). In these areas the average velocities measured along the corresponding LoS can be quantified as about 9 mm/year for the Pescosolido landslide and approximately 35 mm/year for the Pisciotta landslide. Moreover, the deformation time history in the Pescosolido area shows a seasonal behaviour, with an increase in the displacement rate in winter, i.e. from December to January, following the seasonal rainy period. Instead, the Ascea landslide shows an almost linear trend, with a slight increase in displacement rate over time from the end of 2014, suggesting a probable ongoing creep process. Fig. 2 - Results of the interferometric processing: A) Ascending and B) Descending LoS displacement maps obtained for the Paternò landslide. C) Descending displacement map obtained for Pescosolido DGSD and D) Ascending displacement map related to Pisciotta landslide and respective displacement time series plotted at the centre of the landslide area (black triangles).