GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 3.2 - POSTER GNGTS 2023 3D GPR model in the military district of San Giacomo (Palermo) P . Capizzi, R. Martorana, A. Canzoneri, A. Carollo, M.V. Majani Dipartimento di Scienze della Terra e del Mare, Università degli Studi di Palermo,  Introduction The aim of this work is to verify the presence of buried anthropogenic structures and the archaeological imprint inside the Bonsignore square (fig. 1), located inside the 12th Carabinieri Regiment Barrack within the city of Palermo. The study is moreover focused on the analysis of probable links between these buried structures and those, already studied (Capizzi et al., 2021), recognized inside the church of San Paolo D'Alga, present on one side of the square. The area was investigated using the Ground Penetrating Radar (GPR) technique. The GPR is a geophysical method using radiated impulsive electromagnetic waves obtaining information on the subsoil. The relative permittivity of the different subsoil layers is the main property that influences waves velocity. Both magnetic permeability and electrical conductivity furthermore controls the amplitude and attenuation of a propagating wave (Baker et al., 2007). Indeed, wave propagation velocity depends on the dielectric constant and magnetic susceptibility of the media (Baker et al., 2007, Cozzolino et al., 2018). Depending on these different physical features, different for any subsoil layers, electromagnetic wave that travels underground is subjected todifferent phenomena during the passage from one medium to another. Using antennas with different features also realized prospections with more or less depth of investigation or resolution depending on the antennas shape and size of the and frequencies and wavelengths applied. GPR is a non-destructive investigation methodology that is a great advantage to investigate monumental assets. Many studies on the architectural heritage in which GPR techniques were applied for different purposes are present, such as verifying structural elements stability of churches (Ranalli et al., 2004; Masini et al., 2010; Pérez-Gracia et al., 2013) or the damage degree of others historical buildings (Binda et al., 2005). Furthermore, many studies focused on preservation of mural paintings (Pieraccini et al., 2005; De Giorgi et al., 2020) and mosaic (Capizzi et al., 2012). Another use is related to the detection of previous architectural planimetries buried (Cozzolino et al., 2020; Capizzi et al., 2021) as well as other ancient structures like walls (Basile et