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Authors: Bertrand, E.* 
Duval, A.-M.* 
Régnier, J.* 
Azzara, R. M.* 
Bergamashi, F.* 
Bordoni, P.* 
Cara, F.* 
Cultrera, G.* 
Di Giulio, G.* 
Milana, G.* 
Salichon, J.* 
Title: Site effect variability of the Roio basin in the near-source area of the L'Aquila mainshock
Issue Date: 2010
Keywords: site effect
L'Aquila earthquake
Subject Classification04. Solid Earth::04.06. Seismology::04.06.04. Ground motion 
Abstract: In the frame of the microzonation studies of the April 6th, 2009 L'Aquila earthquake near-source area, we observed local seismic amplifications in the Roio area, a plain separated from L'Aquila city center by mount Luco. Six portable, digital instruments were deployed across the plain from the 15th of April until mid-May 2009. This array recorded up to 152 aftershocks. We analysed the ground motion from these events to determine relative site amplification within the plain and on the surrounding ridges. Horizontal over Vertical spectral ratio on noise data (HVSRN) and on aftershock recordings (HVEQ)as well as standard spectral ratio (SSR) show amplifications at 1.3 Hz and 4.0 Hz on the quaternary deposits. Seismic amplifications in the frequency range between 4 and 6 Hz were also observed on a carbonate ridge of Colle di Roio located on the northwest border of the plateau. A small amplification has also been noticed close to the top of mount Luco, another rocky site. This paper details the results we have obtained and addresses their interpretation.
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