Mapping seismic vulnerability in buildings by means of open source tools and open data

In this paper we will show an example of the use of open source software and open data, recently available in Italy, for the determination of some parameters useful for assessing the seismic vulnerability of each building potentially exposed to such events. It should be noted that, at least in the national context, there have been a series of legal regulations that have made the properties of the buildings in the seismic zone, both of masonry and reinforced concrete, increasingly uniform. It is therefore important to evaluate the correlation between the implementation of these regulations with the actual damage suffered by such buildings during a real event. Among the various parameters that can then be hypothesized and used to estimate vulnerability, we will show a method to determine the year of construction of each single building, often not available with certainty at least on a nationwide scale. From this information, estimated for each single building in the center of the city of Aquila, the possible correlation will be evaluated with the actual damage recorded for the same buildings after the known magnitude 5.9 event of April 6, 2009 (Cheloni et al., 2010; Locati M. et al., 2011).