GNGTS 2022 - Atti del 40° Convegno Nazionale

GNGTS 2022 Sessione 1.1 59 CONVERGENCE BETWEEN ADRIA AND EURASIA PLATES: INSIGHTS FROM GNSS TIME SERIES IN NORTH-EEASTERN ITALY L. Tunini, A. Magrin, D. Zuliani, G. Rossi National Institute of Oceanography and Applied Geophysics (OGS) - Italy It is widely known that deformation and seismicity characterize the North-Eastern Italy, and in particular the Friuli Venezia Giulia region, expressions of the interplay between Adria and Eurasia plates. The Friuli Venezia Giulia Deformation Network (FReDNet, http://frednet. crs.ogs.it/DOI/ ) is a permanent GNSS network established since 2002 by the Centro Ricerche Sismologiche of the National Institute of Oceanography and Applied Geophysics - OGS, in order to monitor the crustal deformation in this region, and to provide a valid contribution to the “Sistema di Monitoraggio terrestre dell’Italia Nord Orientale (SMINO)” of NE-Italy (Bragato et al. , 2021). FReDNet currently counts 19 permanent GNSS stations, which continuously provide real-time data and daily and hourly files in the standard RINEX format, accessible through a public ftp repository. In order to place the regional deformation in a broader tectonic context, we processed the data coming not only from FReDNet but also from other geodetic networks covering northern Italy and surrounding areas (including some sites in Slovenia and Austria), available in the time interval 2002-2021. We used the GAMIT-GLOBK software package ver10.71 (Herring et al. , 2018) to be capable of processing multi-satellite data and to calculate the position and velocity for each station. In this work, the processing strategies and data analyses of the GNSS time-series of NE- Italy stations are shown, as well as the outcoming deformation field. The preliminary results confirm the decrease in the velocity module from the Friuli plain toward the Alps, suggesting a possible deformation accrual in the latter. This research was supported by OGS and CINECA under HPC-TRES program award number 2020-11. We acknowledge the CINECA award under the ISCRA initiative, for the availability of high performance computing resources and support (IscraC IsC83_GPSIT-2). References Bragato, P. L., Comelli, P., Sara., A., Zuliani, D., Moratto, L., Poggi, V., Rossi, G., Scaini, C., Sugan, M., and Barnaba C., et al. 2021. The OGS - Northeastern Italy seismic and deformation network: Current status and outlook , Seismol. Res. Lett. 92, no. 3, 1704–1716, doi: https://doi.org/10.1785/0220200372. Herring, T.A. and King, R., Floyd, M.A. and McClusky, S. C. 2018. GAMIT Reference Manual: GPS Analysis at MIT, Release 10.7 . Department of Earth. Tech. rep., Massachusetts Institute of Technology, Cambridge, Mass. URL: <http://geoweb.mit.edu/gg/Intro_GG.pdf >.