GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.3 - POSTER GNGTS 2023 Development of a seismo-gravimetric model of the crust of North-Eastern Italy L. S. Zampa 1 , C. Barnaba 1 , G. Böhm 1 , G. Bressan 1 , A. Magrin 1 , G. Rossi 1 , D. Scafidi 2 , D. Spallarossa 2 , R. Tondi 3 , A. Viganò 4 1 National Institute of Oceanography and Applied Geophysics - OGS, Sgonico, Italy 2 Dipartimento di Scienze della Terra dell’Ambiente e della Vita, Università degli Studi di Genova, Genova, Italy 3 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Bologna, Italy 4 Servizio Geologico, Provincia autonoma di Trento, Trento, Italy We present the development of a seismo-gravimetric model of the crust of North-Eastern Italy with the use of the Sequential Integrated Inversion of seismic and gravity data inversion (Tondi et al., 2019). The study area includes the northernmost edge of the convergent margin between the Eurasian Plate and the Adriatic Microplate. The complex superposition and relative motions of these three crustal blocks are the cause of the persistent seismic activity recorded by various transboundary seismic networks in recent decades. The seismological data combines the long term observations from permanent networks in the area with the dense station distributions of temporary networks of the international collaborative projects AlpArray (Hetenyi et al., 2018) and SwathD (Heit et al., 2021). Our catalogue includes 3324 events recorded from 1988 to 2021. The P and S arrivals of the events until the 2008 were manually picked and already used in two previous tomographic inversion (Bressan et al, 2012; Viganò et al. 2013). The arrivals after 2009 are automatically picked by CASP procedure (Scafidi et al., 2019). The gravity anomalies are from the Pan-Alpine Gravity Database (Zahorec et al., 2021). We tested two different strategies for earthquake tomography. The first uses the tomographic software Cat3d (Böhm et al., 2014), integrated with the software Nnloc for hypocenter estimate (Böhm and Moratto, 2022). The second uses the software Simulps (Eberhart-Phillips et al., 2017) for the simultaneous inversion of both hypocenters and seismic velocities.  We thank all the institutions that manage the seismic networks in the area: the Northeast Italy Seismic Network, the Northeast Italy Broadband Network, The Trentino Seismic Network, the Friuli Venezia Giulia Accelerometric Network, the Italian Seismic Network, the Mediterranean Very Broadband Seismographic Network, the Province Südtirol Network, the Seismic Network of the Republic of Slovenia, the Austrian Seismic Network, the Switzerland Seismological Network, and the Croatian Seismograph Network.