Abstract
The impact of the two seismic events of August 24th 2016 on the municipality of Amatrice was highly destructive. There were 298 victims, 386 injured, about 5000 homeless, and the historical center of the town suffered a great number of partial and total collapses. The 260 strong motion records obtained for the first event were analyzed and plotted in a shakemap, comparing them with the macroseismic damage surveys made in 305 localities. On the basis of an inspection survey made in September 2016, a map of the damage patterns of the buildings in the historical center was elaborated according to the EMS 98 classification. The damage level resulted very high with more than 60% of the inspected buildings showing partial or total collapse. The elevated level of destruction was mainly caused by the high vulnerability of the masonry buildings, mostly due to specific vulnerability factors such as the poor quality of masonry, the lack of connections between walls and the poor connection between external walls and floors.
Highlights
The seismic events which hit Central Italy on August 24, October 26 and October 30 2016 have caused casualties and major damage mostly to buildings and architectural heritage of the Italian regions of Abruzzo, Lazio, Marche and Umbria
The 260 strong motion records obtained for the first event were analyzed and plotted in a shakemap, comparing them with the macroseismic damage surveys made in 305 localities
On the basis of an inspection survey made in September 2016, a map of the damage patterns of the buildings in the historical center was elaborated according to the EMS 98 classification
Summary
The seismic events which hit Central Italy on August 24, October 26 and October 30 2016 have caused casualties and major damage mostly to buildings and architectural heritage of the Italian regions of Abruzzo, Lazio, Marche and Umbria. The mainshock occurred on August 24 at 3:36 am (local time) with epicenter close to Accumoli (Rieti province) and a magnitude Mw = 6.2; it was followed, at 4.33 am, by an aftershock with epicenter close to Norcia (Perugia province) and a magnitude Mw = 5.5 These events caused a total of 299. Most of the victims were in the areas of Amatrice, Accumoli, and Arquata del Tronto In these municipalities heavy damage and collapse of residential buildings were reported. The results of the survey performed by the authors in September 2016, allowed to assess the damage level, collapse mechanisms and vulnerability factors of 240 buildings out of about 300 in the historical center. The presence of some vulnerability factors such as the lack of strong connections between walls, the poor connection between external masonry walls and floors and especially the inadequate quality of masonry, were the main causes of the activation of mostly out-of-plane collapse mechanisms
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