Seismic mitigation measures are becoming increasingly important in order to support the sustainable development of cities around the world. Disaster Risk Reduction is a consolidated field of study and an integral part of civil protection and construction practices. The definition of strategies aiming at reducing the risk requires two fundamental steps: the first consists of the evaluation of the impact in the current state while for the second, the impact is estimated having adopted appropriate mitigation strategies. The comparison between the losses (of buildings, human lives, and economic) calculated in the two steps defines the effectiveness of the mitigation measures considered. The impact is defined through the consideration of three factors: hazard, vulnerability, and exposure. The hazard is the probability that a fixed event occurs in a fixed period of time; the vulnerability is the probability that an element at risk reach a fixed level of damage; the exposure represents the vulnerability distribution on the invested area. Vulnerability and exposure are strictly connected: with respect to the buildings, the vulnerability depends on their typological and structural characteristics, so the exposure represents the distribution on the investigated area of these building’s features. This paper presents a procedure to define the exposure of the current state of an investigated area through the buildup of a structured database to facilitate the knowledge of the area. The database is populated using the ISTOS survey form, developed and customized by the ISTOS research center on the basis of previous works of the PLINIVS study center. Aim of the build-up of the database is the knowledge on the vulnerability distribution on the territory at the current state to have a start point for considerations on mitigation assumptions.
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