ALBERT

Description: The INGV RING research infrastructure is based on a permanent GNSS network developed to measure deformation at different spatial and temporal scales in the Mediterranean region. The network (http://ring.gm.ingv.it/) consists of ~250 real-time transmitting remote sites, using standard RTCM format, towards the Irpinia acquisition centres (Southern Italy). Data streaming is managed by a Ntrip Caster (https://igs.bkg.bund.de/ntrip/bkgcaster), whose sourcetable is synchronized with the RING database, thus guaranteeing reliable metadata for the analysis. Within the EWRICA project, the real-time data analysis is performed by using the RTPPP software (Ge et al.,2012) that provides different Precise Point Positioning products with increasing accuracies (standard PPP, PPP-AR and PPP-RA). On 24-h data, the ambiguity resolution (PPP-AR) and the regional augmentation (PPP-RA) allows accuracies of ~1 cm and ~3 cm for the horizontal and vertical components, respectively, at the best sites. Using shorter sliding windows (i.e. 60 s or 120 s, thus simulating a real-time situation), the accuracies are ~0,5 cm and ~1 cm for horizontal and vertical components, respectively. We also tested a homemade algorithm able to detect co-seismic static offsets in real-time in a simulated real-time strategy. The first results make the RING real-time solutions a potential contribution to be tested in earthquake and tsunami warning systems in Italy and surrounding regions. We will show the RING architecture, from the data to the PPP results, an evaluation of the uncertainties, and some examples of offset detection for recent earthquakes.