Attenuation relationship of macroseismic intensity in Italy for probabilistic seismic hazard assessment

A statistical analysis of macrosesmic intensity decay with distance has been conducted by using the most recent compilation of felt intensities relative to Italian earthquakes. An innovative aspect of the present study has been the attempt to define criteria for the validation of the attenuation relationships considered in their complete probabilistic form by a quantitative comparison with observed macroseismic fields. From the results of our analyses, a new attenuation relationship is proposed for the Italian territory, based on two independent variables only: epicentral intensity and hypocentral distance. Preliminary indications on the existence of differentiated attenuation features of macroseismic intensity over the national territory were gained.

[1]  D. Albarello,et al.  The Role of Data Processing and Uncertainty Management in Seismic Hazard Evaluations: Insights from Estimates in the Garfagnana–Lunigiana Area (Northern Italy) , 2003 .

[2]  Paolo Gasperini,et al.  The Attenuation of Seismic Intensity in Italy: A Bilinear Shape Indicates the Dominance of Deep Phases at Epicentral Distances Longer than 45 km , 2001 .

[3]  Gianluca Valensise,et al.  Catalogue of Strong Italian Earthquakes from 461 B.C. to 1997 (Appendix to volume 43 N° 4, 2000) , 2000 .

[4]  D. Albarello,et al.  The Problem of Regionalization in the Study of Magnitude-intensity Correspondences in the Mediterranean Area: A Distribution-free Approach , 1999 .

[5]  Dario Albarello,et al.  Estimates of site seismicity rates using ill-defined macroseismic data , 1994 .

[6]  Robin K. McGuire,et al.  Computations of seismic hazard , 1993 .

[7]  Antonio Pugliese,et al.  Attenuation of peak horizontal acceleration and velocity from italian strong-motion records , 1987 .

[8]  D. Albarello,et al.  Italian intensity hazard maps: a comparison of results from different methodologies , 2002 .

[9]  E. Boschi.  Catalogo dei forti terremoti in Italia , 1995 .

[10]  N. M. S. Rock,et al.  Numerical geology , 1988 .

[11]  F. Perotti,et al.  On the Attenuation of Macroseismic Intensity with Epicentral Distance , 1987 .

[12]  Ezio Faccioli,et al.  Engineering seismic risk analysis of the Friuli region , 1979 .

[13]  Carl Allin Cornell,et al.  Probabilistic Analysis of Damage to Structures under Seismic Loads , 1971 .