Ioannou, I; Verrucci, E; Arcidiacono, V; Rossetto, T; (2018) Empirical fragility assessment of the Italian masonry buildings using data from the Emilia 2012 sequence of earthquakes. In: Proceedings of the 16th European Conference on Earthquake Engineering 2018. (pp. p. 11306). The European Association for Earthquake Engineering: Thessaloniki, Greece.

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Abstract

On 20th May 2012, the Emilia-Romagna region in Italy was woken up by a strong earthquake of magnitude Mw=5.9. A seismic sequence followed with more than 2,200 shocks, the most significant of which was the Mw=5.8 earthquake that struck at 09:00:03 local time (07:00:03 UTC) on 29th May. The earthquakes affected a wide area which included 59 municipalities in the provinces of Modena, Bologna, Ferrara and Reggio-Emilia. This study used a damage database which included information regarding 41,216 residential buildings surveyed mainly in the aftermath of the second event to construct a unique set of fragility curves for masonry and RC buildings based on a sequence of events which have caused cumulative damage to an unknown number of buildings. The present study highlights issues with the data quality, commonly overlooked by the literature, and proposes ways to address non-representative samples and missing data. The comparison of the fragility curves for RC buildings with their counterparts based on the 1980 Irpinia shows that there is higher overall likelihood of damage due to the sequence of events, than the one strong earthquake.

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