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Abstract
Cultural heritage represents our legacy with the past and our identity. However, to assure heritage can be passed on to future generations, it is required to put into the field knowledge as well as preventive and safeguard actions, especially for heritage located in seismic hazard-prone areas. With this in mind, the article deals with the analysis of ground response in the Avellino town (Campania, Southern Italy) and its correlation with the effects caused by the 23rd November 1980 Irpinia earthquake on the historical buildings. The aim is to get some clues about the earthquake damage cause-effect relationship. To estimate the ground motion response for Avellino, where strong-motion recordings are not available, we made use of the seismic hazard disaggregation. Then, we made extensive use of borehole data to build the lithological model so being able to assess the seismic ground response. Overall, results indicate that the complex subsoil layers influence the ground motion, particularly in the lowest period (0.1–0.5 s). The comparison with the observed damage of the selected historical buildings and the maximum acceleration expected indicates that the damage distribution cannot be explained by the surface geology effects alone.
Highlights
Avellino is a town of historical interest, which is located in a structural depression of the CampanianApennines, in the Irpinia region (Southern Italy) (Figure 1)
In the Irpinia region (Southern Italy) (Figure 1). This is an area with a high seismic hazard where the peak ground acceleration (PGA) with a 10% probability of being exceeded in 50 years has been estimated in the range 0.20–0.27 g
To get some clues about the cause-effect relationship, in this work we investigated the ground response and the damage levels in some historical buildings of Avellino, taking advantage of a detailed knowledge of the surface geology of the Avellino urban area
Summary
Avellino is a town of historical interest, which is located in a structural depression of the Campanian. Numerous religious and civil architectures remain in Avellino downtown at present, testifying with their restoration history and scars the seismic hazard of the territory as well as the vulnerability of the heritage. The locality was hit by about tenwith earthquakes with site intensity architectures remainhistory in Avellino downtown at present, testifying their restoration history and than or equal of tothe. Considering that strong-motion recordings in Avellino are not available, the definition of the seismic input in the assessment of the ground response was performed making use of a probabilistic approach, using the seismic hazard disaggregation This method is aimed at defining seismic events by classes of magnitude and distance from the site, which provides the largest contribution to ground motion exceedance for defined hazard levels. We correlated retrospectively the estimated seismic response to the damage produced by the 1980 earthquake for the historical buildings
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