GNGTS 2017 - 36° Convegno Nazionale

282 GNGTS 2017 S essione 2.1 Selection and ranking of the Ground Motion Prediction Equations for the new Italian hazard map (MPS16) G. Lanzano 1 , L. Luzi 1 , R. Rotondi 2 , E. Varini 2 , W. Marzocchi 3 1 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Milano, Italy 2 Istituto di Matematica Applicata e Tecnologie Informatiche CNR, Milano, Italy 3 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma, Italy Introduction. The MPS16 project, started in 2015, aims at updating the existing reference seismic hazard model for Italy, released in 2004-2006 (Stucchi et al., 2011). As known, ground- motion prediction equations (GMPEs) play a basic role in probabilistic seismic hazard assessment and, thus, special care should be taken to select and rank them in a proper way. GMPEs predict an IM at a given location as a function of earthquake magnitude, style of faulting, distance from the earthquake source, site characteristics and other variables, depending on the complexity of the model. In PSHAcalculations GMPEs are combined in a logic tree framework, in order to take into account epistemic uncertainties, therefore ranking/scoring procedures have become very Fig. 1 - Maps of the location of the events selected for the ranking of GMPEs for ACRs. b) Magnitude – distance distribution.