GNGTS 2018 - 37° Convegno Nazionale

GNGTS 2018 S essione 1.2 169 INSIGHTS INTO THE SEISMIC POTENTIAL OF THE VENETIAN SOUTHERN ALPS (ITALY) FROM THE INTEGRATION OF GPS AND INSAR VELOCITIES L. Anderlini 1 , E. Serpelloni 1 , G. Pezzo 2 , C. Tolomei 2 , P.M. De Martini 3 , A. Gualandi 4 1 CNT, INVG, Bologna, Italy 2 CNT, INGV, Roma, Italy 3 Roma1, INGV, Roma, Italy 4 JPL, CalTech, USA The Venetian sector of the Eastern Southern Alps (ESA) is part of the convergence margin between the Adriatic and the Eurasian plates, where most of the strong instrumental and historical earthquakes in Northern Italy have been recorded. However most of the seismogenic sources associated with these large earthquakes are still debated (DISS working group). In this work we integrate InSAR and GPS velocities across the Montello and Bassano-Valdobbiadene thrust system, with the goal of determining a new spatially dense 3D interseismic velocity field. The integrated geodetic velocity field has been used in order to characterize faults that are accumulating elastic strain. We use two InSAR velocity fields obtained from ENVISAT satellite acquisitions along both ascending and descending orbits in the 2004-2010 time-span and elaborated using the SBAS multitemporal InSAR technique (Berardino et al. , 2002). We use a GPS velocity field obtained Fig. 1 - Geodetic velocity dataset: the black arrows show the horizontal GPS velocities (with 95% error ellipses) in a fixed-Adria reference frame, whereas the colored circles show the vertical GPS velocities. The colored diamonds show the vertical ground motion rates estimated from the IGMI leveling data and the two squares indicate the ascending and descending ENVISAT frames.