GNGTS 2015 - Atti del 34° Convegno Nazionale

GNGTS 2015 S essione 2.1 25 Postseismic deformation maps from Cosmo-SkyMed (Fig. 2) show positive values (approaching to the sensor) in the 2012 epicentral area, reaching about 20 mm yr -1 in both ascending and descending geometries. As for the ERS and ASAR maps, there is a rough correspondence between the growing anticline and the positive velocity values, and vice versa; in particular this is visible in correspondence of the 2012 epicentres, represented by the red stars in Fig. 2. Thus, there are some similar patterns between pre- and post-seismic maps. Observed local subsidence is interpreted as due to fluid migration and compaction of the Po plain sediments. Post-seismic time series show quasi-exponential afterslip deformation patterns in the epicentral area for both the ascending and the descending maps (Fig. 2). Fig. 2 – COSMO-SkyMed ascending mean velocity map along with an example of displacement time series (Jul. 2012-Dec. 2013). The measurements are in line of sight (LoS): positive values (blue colours) are approaching to the sensor; vice versa for negative ones (red colours). Red stars indicate the main (Mw ≥ 5.0) seismic events; magnitudes are expressed as Mw. Black triangles represents the CGPS.