“…GPS surveys represent a key tool to investigate geodynamic processes at the Earth's surface and estimate volcanic and seismic strain in active areas, such as along faults or signals from magmatic injections at surface, occurring inside volcanic reservoirs [Dvorak and Dzurisin 1997, Anzidei et al 1998, Anzidei et al 2001, Serpelloni et al 2005, Serpelloni et al 2006, Anzidei et al 2008, Tregoning and Rizos 2008, Esposito et al 2010, Patanè et al 2013, De Martino et al 2014, Ferranti et at. 2014, Baldi et al 2015. Surveys style GPS networks set up in Italy during the last decades, now have a crucial role to densify the current CGPS networks, thus better constraining the velocity field solutions and related strain maps, especially during seismic cycle and hydrothermal volcanic systems [Anzidei et al 2009.…”