GNGTS 2014 - Atti del 33° Convegno Nazionale

GNGTS 2014 S essione 1.1 111 Fig. 2 – mosaicked mean velocity maps in ascending (A) and descending (B) geometries. The measurement are in line of sight (LoS): positive values (blues colours) are approaching to the sensor; vice versa for negative ones (red colours). In panel C and D we show the time series calculated in the epicentral area of the 2012 seismic sequence for the ascending and descending measurements respectively. due to fluid migration and compaction of the Po plain sediments. Analyzing the post-seismic time series we observe a quasi-exponential afterslip deformation pattern in the epicentral area for both the ascending (Fig. 2C) and the descending (Fig. 2D) maps. Preliminary post-seismic source modeling. We modelled the retrieved post-seismic deformation using the seismic source obtained for the co-seismic modelling (Pezzo et al. , 2013), using the elastic dislocation model of Okada, 1985. We obtain a good agreement between observed and modelled velocity field (Fig. 3B), as shown in the residual velocity maps (Fig. 3C). We inverted only for the slip distribution, using the same geometric and kinematic parameters the co-seismic case. The retrieved slip distribution (Fig. 3D) shows a similar pattern compared to the co-seismic one (Fig. 3E). Conclusions • InSAR operational monitoring of the earthquake ground deformation during the coseismic and post-seismic periods is today feasible using SAR satellite constellations as COSMO- SkyMed, thanks to their short repeat pass (down to 1 day). • Ground velocities and displacement time series obtained from multi-temporal InSAR