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Authors: De Luca, G.* 
Del Pezzo, Edoardo* 
Di Luccio, Francesca* 
Margheriti, Lucia* 
Milana, G.* 
Scarpa, R.* 
Title: Site response study in Abruzzo (Central Italy): Underground array versus surface stations
Issue Date: 1998
Series/Report no.: /2 (1998)
Abstract: In this site response study we examined local earthquakes recorded at surface stations of a local seismic network and at a temporary underground seismic array installed in a tunnel underneath the Gran Sasso Massif in Abruzzo (central Italy). This allowed us to compare the seismic site response beneath the mountain and on the surface in similar geological environment (soft rock sites). We applied spectral ratios method on different segments of the seismograms and used different reference spectra in the 1–20 Hz frequency band. We found little or no amplification effects at most of the surface stations whereas site transfer functions evaluated with respect to underground sites show an amplification factor up to 6 in the 1–8 Hz frequency range. Coda spectral ratios estimated at soft rock sites are confirmed as good estimates of shear wave transfer function.
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