Probabilistic seismic hazard assessment at global level

In the framework of the UNISDR׳s Global Assessment Report on Disaster Risk Reduction 2013, for the first time, a fully probabilistic seismic hazard assessment was conducted at global level, using the same methodology for the whole Globe, from which a set of stochastic scenarios for different intensities (spectral accelerations, 5% damping) was obtained and then used in a fully probabilistic risk analysis. First, the Globe was divided into a set of seismogenetic areas to which a maximum magnitude and a predominant tectonic environment type were assigned. A Gutenberg–Richter magnitude–frequency distribution was assumed for each region, with a and b-values computed using a smoothed-seismicity procedure based on the NEIC11 al Earthquake Information Center. 2 States Geological Survey. ic catalog. This catalog was first subjected to a declustering process and completeness verification for several threshold magnitudes. Based on the tectonic environment assigned to each source, a ground motion prediction model was assigned accordingly. Probabilistic hazard computations were performed with program CRISIS 2012, which generated conventional hazard curves for different intensities and maps for various return periods, as well as a set of stochastic scenarios compatible with the CAPRA33 hensive Approach to Probabilistic Risk Assessment. orm. These scenarios, in turn, were used to perform coarse-grain probabilistic risk computations.