Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/13293
Authors: Famiani, Daniela* 
Brunori, Carlo Alberto* 
Pizzimenti, Luca* 
Cara, Fabrizio* 
Caciagli, Marco* 
Melelli, Laura* 
Mirabella, Francesco* 
Barchi, Massimiliano Rinaldo* 
Title: Geophysical reconstruction of buried geological features and site effects estimation of the Middle Valle Umbra basin (central Italy)
Journal: Engineering Geology 
Series/Report no.: / 269 (2020)
Publisher: Elsevier
Issue Date: 20-Feb-2020
DOI: 10.1016/j.enggeo.2020.105543
Keywords: site effects
seismic site characterization
subsoil model
spectral ratios
Valle Umbra
passive arrays
Subject Classification04.06. Seismology 
Abstract: The Middle Valle Umbra (central Italy) is a NW-SE 20 km long and 10 km wide Quaternary extensional basin located in the internal sector of the Apennine chain. This area historically experienced strong earthquakes that caused significant damages to the outstanding historical heritage. The same area has been recently hit by the 2016 seismic sequence of Amatrice-Visso-Norcia. With the aim to reconstruct the buried geological structures of the basin, a multi-technique geophysical approach was performed. An extended campaign of ambient noise measurements was carried out to investigate the subsurface setting, and to identify the main geological units. We performed three 2D passive arrays to analyze two different sites within the basin; their aperture was between 150 and 752 m for one site and of 48 m for the other site, to characterize the geological units in terms of sediment thickness and shear-wave velocity profile. Data collected were processed with f-k and MSPAC analysis to extract dispersion curves with good resolution in a frequency range of 0.5–10 Hz and 4.5–18 Hz for the two sites respectively. Spectral ratios were computed for every single station ambient noise measurement performed and for all the stations of the bigger array. Our final target is to extend these results to the whole valley, in order to retrieve the attitude of the main geological units and propose a reliable reconstruction of the subsurface geometry of the basin. Another point of this work is to evaluate the site response in the middle of the valley through the analysis of the earthquakes recorded by the accelerometric station IT.CSA (belonging to the Italian Civil Protection) and the corresponding recordings of the nearby rock station IT.ASS.
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