The earthquake occurred on 6th April 2009 in Abruzzo has been characterized by distinctive features in terms of macro-seismic intensity and local amplifications. In this paper an estimate of the peak ground acceleration (PGA) has been performed analysing the observed damage mechanisms and using also conventional tools for the seismic vulnerability assessment. The case here described concerns the church of Santa Gemma Vergine in Goriano Sicoli, a small village of the Subequana valley in Abruzzo, located at about 700 m s.l. and 50 km far from L’Aquila (the earthquake epicentre). The zone is marked by relevant seismic vulnerability and subjected to local amplification effects due to high variability of soil type. At first, the PGA on the site of Goriano Sicoli has been predicted using the distance attenuation law applied to the signals recorded by some accelerometric stations in the overall zone around the epicentre. Successively, the trigger acceleration of the recognised damage mechanisms of the church has been interpreted as the anchorage value attained by the local PGA. Finally, the comparison among the results allows to appreciate also the extent of the site effects.
LA CHIESA DI SANTA GEMMA A GORIANO SICOLI (AQ): INPUT SISMICO E MECCANISMI DI DANNO
SASSU, MAURO;
2012-01-01
Abstract
The earthquake occurred on 6th April 2009 in Abruzzo has been characterized by distinctive features in terms of macro-seismic intensity and local amplifications. In this paper an estimate of the peak ground acceleration (PGA) has been performed analysing the observed damage mechanisms and using also conventional tools for the seismic vulnerability assessment. The case here described concerns the church of Santa Gemma Vergine in Goriano Sicoli, a small village of the Subequana valley in Abruzzo, located at about 700 m s.l. and 50 km far from L’Aquila (the earthquake epicentre). The zone is marked by relevant seismic vulnerability and subjected to local amplification effects due to high variability of soil type. At first, the PGA on the site of Goriano Sicoli has been predicted using the distance attenuation law applied to the signals recorded by some accelerometric stations in the overall zone around the epicentre. Successively, the trigger acceleration of the recognised damage mechanisms of the church has been interpreted as the anchorage value attained by the local PGA. Finally, the comparison among the results allows to appreciate also the extent of the site effects.
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