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Authors: Vanini, Manuela* 
Corigliano, Mirko* 
Faccioli, Ezio* 
Figini, Raffaele* 
Luzi, Lucia* 
Pacor, Francesca* 
Paolucci, Roberto* 
Title: Improving seismic hazard approaches for critical infrastructures: a pilot study in the Po Plain
Journal: Bulletin of Earthquake Engineering 
Series/Report no.: /16 (2018)
Issue Date: 2018
DOI: 10.1007/s10518-017-0102-1
Abstract: Paper describes the extensive work done in the SIGMA project, aimed at improving knowledge on data, methods and tools to better quantify uncertainties in seismic hazard assessment (SHA). The authors cooperated in the study of potential faults and geological structures, earthquake catalogues, selection of ground motion prediction equations, and methods for site effect evaluation suitable for SHA. All the contributions merged into a probabilistic seismic hazard study conducted for three representative sites of the Po Plainin Northern Italy. Po Plain is a low-to-moderate seismicity region, characterized by some critical features, such as blind faulting and deep alluvium sediments, and by scarcity of strong motion data; these sources of uncertainties in seismic hazard estimation are common to other low seismicity areas around the world. Within SIGMA, special care was devoted to: (a) the use of the single station sigma approach inside the probabilistic SHA, (b) the comparative use of generalized attenuation functions to evaluate the hazard contribution of composite fault systems, and (c) the study of the epistemic uncertainties at play when different modelling approaches to site effects are used.
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