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Authors: Grezio, A.* 
Gasparini, P.* 
Marzocchi, W.* 
Patera, A.* 
Tinti, S.* 
Title: Tsunami risk assessments in Messina, Sicily – Italy
Issue Date: 2012
Series/Report no.: /12 (2012)
DOI: 10.5194/nhess-12-151-2012
Keywords: Probabilistic Bayesian analysis- Building tsunami risk assessment - Human tsunami risk assessment
Subject Classification05. General::05.08. Risk::05.08.01. Environmental risk 
Abstract: We present a first detailed tsunami risk assessment for the city of Messina where one of the most destructive tsunami inundations of the last centuries occurred in 1908. In the tsunami hazard evaluation, probabilities are calculated through a new general modular Bayesian tool for Probabil- ity Tsunami Hazard Assessment. The estimation of losses of persons and buildings takes into account data collected directly or supplied by: (i) the Italian National Institute of Statistics that provides information on the population, on buildings and on many relevant social aspects; (ii) the Italian National Territory Agency that provides updated economic values of the buildings on the basis of their typology (res- idential, commercial, industrial) and location (streets); and (iii) the Train and Port Authorities. For human beings, a fac- tor of time exposition is introduced and calculated in terms of hours per day in different places (private and public) and in terms of seasons, considering that some factors like the number of tourists can vary by one order of magnitude from January to August. Since the tsunami risk is a function of the run-up levels along the coast, a variable tsunami risk zone is defined as the area along the Messina coast where tsunami inundations may occur.
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