GNGTS 2018 - 37° Convegno Nazionale

324 GNGTS 2018 S essione 2.1 consistenti con la risposta necessaria per sorgenti locali, al di fuori di una “blind zone” che non può venire raggiunta dall’allerta, ma nella quale lo scuotimento, le anomalie del livello del mare e altri segnali naturali dovrebbero indurre le persone ad allontanarsi comunque nel più breve tempo possibile. Al Centro Allerta Tsunami dell’INGV si sta lavorando per migliorare le prestazioni della componente upstream del sistema di monitoraggio, ovvero l’analisi rapida del terremoto, mirando a ridurre i tempi necessari per il calcolo di soluzioni ipocentrali e magnitudo affidabili, e il forecast dello tsunami, per migliorare la capacità predittiva del sistema e ottenere così una migliore stima dei livelli di allerta, che tenga conto in modo quantitativo delle incertezze connesse alla stima rapida della pericolosità. TSUNAMI VULNERABILITY OF ITALIAN COASTAL RESIDENTIAL AREAS WITH A LARGE SCALE APPROACH S. Belliazzi 1 , M. Del Zoppo 1 , M. Di Ludovico 1 , G.P. Lignola 1 , A. Prota 1 , D. Di Bucci 2 , M. Dolce 2 , I. Antoncecchi 3 , F. Terlizzese 3 1 RELUIS, “The Laboratories University Network of seismic engineering”, Naples, Italy 2 National Civil Protection Department – CPD, Rome, Italy 3 Directorate-General for Safety of Mining and Energy Activities National Mining Office for Hydrocarbons and Georesources – DGS-UNMIG MiSE, Rome, Italy Introduction. The Italian Ministry of Economic Development, Directorate-General for Safety of mining and energy activities (MiSE-DGS), with the technical support of the National Civil Protection Department (CPD), has conceived the SPOT project (potentially triggerable offshore seismicity and tsunamis). It aims at improving knowledge on the possibility that damaging earthquakes and tsunamis, the latter directly or indirectly induced by these seismic events, be caused by seismogenic faults possibly occurring in proximity of the hydrocarbon exploitation plants offshore the Italian coast (Di Bucci et al., 2017). The project is ended on 31 October 2018. In the framework of the SPOT project, the Italian “ Network of the University Laboratories of Seismic Engineering ” ( ReLUIS ) is performing research on damage and loss scenarios related to the possible occurrence of tsunamis. The considered tsunamis are generated by submarine landslides induced by seismic shaking and by seafloor displacement due to seismogenic fault activation (Belliazzi et al., 2017). The focus is on the vulnerability of existing reinforced concrete (RC) and masonry residential buildings under tsunami loads. The first step of the research required a comprehensive analysis of the state of the art based on existing international reports on the behaviour of structures under past tsunami wave impacts. Technical reports dealing with damages observed after events worldwide, showed how collapse mechanisms of RC and masonry buildings are dependent on some critical parameters involving not only structural elements, but also non-structural elements, like as infill walls in RC buildings. Also, empirical fragility curves, available in literature, provide important additional information on the response of masonry and RC buildings under tsunami actions. In particular, the fragility curves related to the damage caused by the 2011 Japanese tsunami show how masonry buildings are more vulnerable than RC structures, whereas taller buildings exhibit a better response than low rise structures. The study area includes coastal zones of 10 regions from Veneto to Sicily, consequentially a large scale approach has been considered for all subsequent considerations. Different building