Computer-Aided Decision Making for Regional Seismic Risk Mitigation Accounting for Limited Economic Resources  
[PERSON]  
1 Institute of Technologies for Construction, Italian National Research Council (CNR), 80146 Naples, Italy; [EMAIL_ADDRESS] (N.C.); cochuizzi@itc.cnrit (A.O. )1 Institute of Technologies for Construction, Italian National Research Council (CNR), 80146 Naples, Italy; nicola.caterino@uniparthenope. Global targets and common achievements to pursue DRR have been set in the Sendai Framework for Disaster Risk Reduction 2015-2030 [4], adopted at the Third United Nations World Conference on Disaster Risk Reduction in Sendai, Japan, in March 2015. This aims to achieve a substantial reduction in disaster risk and loss of lives, livelihoods and health, and in the economic, physical, social, cultural and environmental assets of people, businesses, communities and countries over the next 15 years. The Sendai Framework works in continuity with the Hyogo Framework for Action [5] of the previous decade (2005-2015), that recognized DRR as a national and local priority. The Sendai Framework sets seven targets and four priorities for action to prevent new and reduce existing disaster risks: (i) understanding disaster risk; (ii) strengthening disaster risk governance to manage disaster risk; (iii) investing in disaster reduction for resilience; (iv) enhancing disaster preparedness for effective response and to \"Build Back Better\" in recovery, rehabilitation and reconstruction. The above priorities are rigidly interconnected: the achievement of enhanced disaster preparedness necessitates incisive investments to be driven by an aware management of DRR, based on a deep knowledge of disaster risk. Consequently, pursuing priority (i), understanding disaster risk, is very important since it is necessary for the achievement of each of the other priorities. Among the objectives constituting priority (i), the Sendai Framework requires the development and dissemination of location-based disaster risk information, including risk maps, to be periodically updated and freely accessible to decision makers, the general public and communities. The United Nation office for disaster risk reduction (UNISDR) developed and launched the Sendai Framework Monitoring System [6], providing an online platform collecting loss data by geographic location. This tool has the potential to provide an important support to the definition of global DRR strategies thanks to data availability, accessibility and interoperability. In order to achieve the global Sendai Framework Monitoring System, UNISDR supports the implementation of national disaster loss data collection systems. The Italian response to the above requirements, with particular concern to the seismic risk, which is historically among the largest sources of risk for this territory, consists of the development of the IRMA (Italian Risk Maps) WebGIS platform [7,8]. The Italian territory is prone to high seismic risk in many areas due to this significant hazard, the elevated exposure provided by the important building heritage and high population density, and the significantly vulnerable building stock [9]. Indeed, many Italian buildings were realized in the absence of seismic code prescriptions, thus fully lacking horizontal load bearing design criteria. In addition, seismic hazard maps are constantly and continuously updated to more severe levels on the basis of new knowledge acquired by experience and by the development of more refined geological models. Inadequate maintenance further limits structural capacity, worsening the vulnerability of buildings against earthquakes. The IRMA platform collects national census data about residential building stock and implements several vulnerability/exposure models to evaluate unconditional damage scenarios within two time windows, namely one year and fifty years.