GNGTS 2014 - Atti del 33° Convegno Nazionale

have been in the order of 36 km, and that those municipalities located within the intensity VI and VII areas could have potentially benefit of an alert. Interestingly, we also found that, in the case of an event having similar epicentre to the 1976 Friuli earthquake, the performance of the EEWS would considerably improve considering the actual CE 3 R Network configuration. For instance, the city of Pordenone, which is about 65 km distant from the 1976 epicentre, had about 9 seconds of lead-time in the 1976, while could potentially benefit of about 13 s today, thanks to the higher stations density of the CE 3 RN. During the period May-September 2014, PRESTo detected in real-time 12 earthquakes in the magnitude range 1.7 to 3.5, of which 10 were correctly detected, while 2 resulted false events. Despite the testing period being still too short to come up with definitive conclusions, it seems that the EEWS given by the integration of PRESTo and CE 3 RN is efficient with respect to earthquakes that occur nearby the area with higher stations density. This testing period of the system was carried out primarily with the goal of highlighting the existence of weak points (both in the hardware, and in the network management and analysis software), as for instance we have identified the problem of using simple time based binding criteria with the network at variable stations density. Indeed, besides the specific characteristics of an EEWalgorithm, the performance of an EEWsystem strongly depends also on technological issues, like for instance the efficiency of the data telemetry and the seismic noise level at the stations. Therefore, especially these latter two aspects will be studied in the next tests of the EEWS. Of course, the realization of the EEWS in the area monitored by CE 3 RN will be accompanied by an extensive activity of communication and training, specifically tailored for the different stakeholders. References Akkar S. and Bommer J. J.; 2007: Empirical prediction equations for peak ground velocity derived from strong- motions records from Europe and the Middle East . Bull Seism Soc Am, 97(2) , 511–530. Bragato P. L., Costa G., Gallo A., Gosar A., Horn N., Lenhardt W., Mucciarelli M., Pesaresi D., Steiner R., Suhadolc P., Tiberi L., Živčić M. and Zoppé G.; 2014: The Central and Eastern European Earthquake Research Network - CE 3 RN . EGU General Assembly 2014, Vienna, Austria, 27 April – 02 May 2014. Carulli G. B. and Slejko D.; 2005: The 1976 Friuli (NE Italy) earthquake . �������� �� �������� ���������� Giornale di Geologia Applicata, 1 , 147-156. Giorgetti F.; 1976: Isoseismal map of the May 6, 1976 Friuli earthquake . Boll. Geofis. Teor. Appl., 19(72) , 707- 714. Lancieri M. and Zollo A.; 2008: Bayesian approach to the real-time estimation of magnitude from the early P and S wave displacement peaks . J. Geophys. Res., 113(B12) , DOI 10.1029/2007JB005386. Luzi L., Hailemikael S., Bindi D., Pacor F., Mele F. and Sabetta F.; 2008: ITACA (ITalian ACcelerometric Archive): a web portal for the dissemination of Italian strong-motion data . ���������� ���� ������ Seismolog. Res. Lett., 79(5) , 716-722 OGS; 1995–2013: Bollettino della Rete Sismometrica del Friuli–Venezia Giulia e del Veneto , OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale), Centro di Ricerche Sismologiche, Udine, Italy. Pacor F., Paolucci R., Ameri G., Massa M. and Puglia R.; 2011: Italian strong motion records in ITACA: overview and record processing . Bull. Earthquake Eng., 9(6) , 1741-1759, DOI 10.1007/s10518-011-9295-x. Pesaresi D., Lenhardt W., Rauch M., Živčić M., Steiner R., Fabris P. and Bertoni, M.; 2014: The Interreg IV Italia- Austria “SeismoSAT” project: connecting seismic data centres via satellite , Adv. Geosci., 36 , 57-60, DOI 10.5194/ adgeo-36-57-2014. Satriano C., Elia L., Martino C., Lancieri M., Zollo A. and Iannaccone G.; 2010: PRESTo, the earthquake early warning system for Southern Italy: concepts, capabilities and future perspectives . Soil. Dyn. Earthq. Eng., 31(2) , 137- 153, DOI 10.1016/j.soildyn.2010.06.008. Zollo A., Amoroso O., Lancieri M., Wu Y. M. and Kanamori H.; 2010: A threshold-based earthquake early warning using dense accelerometer networks . Geophys. J. Int., 183 , 963-974, DOI 10.1111/j.1365-246X.2010.04765. x. GNGTS 2014 S essione 2.3 469