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Since 2004, a continuous Global Positioning System (GPS) network is operated by the Istituto Nazionale di Geofisica e Vulcanologia (INGV) to investigate active tectonic processes in Italy and surrounding regions, which are still largely debated. This important infrastructure, named Rete Integrata Nazionale GPS (RING) network, consists in about 130 stations deployed all over Italy. The development and the realization of a stable GPS monumentation, the integration with seismological instruments and the choice of both satellite and internet data transmission make this network one of the most innovative and reliable CGPS networks in the world. The technologically advanced development of the RING network has been accompanied by the development of different data processing strategies, mainly dependent on the use of different GPS analysis software. The different software-related solutions have been compared for such a large network at different scales and the consistency has been evaluated and quantified within a 0.3 mm/yr RMS value.
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