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Authors: Gomez Capera, A. A.* 
Albarello, D.* 
Gasperini, P.* 
Title: Aggiornamento relazioni fra l'intensità macrosismica e PGA. Progetto INGV-DPC S1, Deliverable D11.
Issue Date: 20-Jul-2007
Keywords: relationships I-PGA
seismic hazard
Subject Classification04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk 
Abstract: Empirical relationships between macroseismic intensity and PGA are useful for comparing the macroseismic observations to recorded peak ground motions and for comparing seismic hazard assessment in terms of intensity with those in PGA. In literature is observed that despite the intensity correlate fairly well with PGA, the relationships I-PGA is the only mathematical instrumental to convert seismic hazard assessment in terms of intensity to PGA. Not many studies deal with the relationship between intensity and PGA and the majority have been published for the western USA and Japan. In Italy, relationships between the intensity data and PGA records have been proposed among others by Margottini et al. (1987, 1992) and by Faccioli and Cauzzi (2006), which used data from earthquakes of the Mediterranean area (Italy, Turkey, Algeria, France and Slovenia). In the present study a probabilistic I-PGA relationship is proposed, based on the datasets from Margottini et. al and from Faccioli and Cauzzi, and adopting a generalized orthogonal regression.
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