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Authors: Gulia, L.* 
Meletti, C.* 
Title: The influence of b-value estimate in seismic hazard assessment
Issue Date: 2006
Keywords: seismic hazard assessment
Subject Classification04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk 
Abstract: In any probabilistic seismic hazard assessment an important role is played by the seismicity rates. This is confirmed by the wide and controversial discussions about the procedures for their determination: Gutenberg and Richter distribution vs independent rates in every magnitude class ; size of binned magnitude class; the fitting algorithm to use (least squares or maximum likelihood); and so on. In 2004 a new probabilistic seismic hazard map of Italy, named MPS04 (MPS04 Working Group, 2004), was released adopting a logic tree approach for exploring the alternative epistemic choices (Fig. 1). For seismogenic zonation (ZS9, MPS04 Working Group, 2004) (Fig. 2) and catalogue (CPTI04; CPTI04 Working Group, 2004) no alternative models were explored.
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