GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 3.2 GNGTS 2024 GPR investgatons in the Santa Maria di Vezzolano rectory (AT) M.F. Alberghina 1,2 , V. Barberis 3 , P. Capizzi 4 , G. Comello 3 , G. Milazzo 3 , S. Schiavone 2 1 Department of Biology, Ecology and Earth Sciences (DiBEST), University of Calabria, Ponte P. Bucci, Cubo 12b, II Piano 87036, Arcavacata di Rende (CS), Italy 2 S.T.Art-Test di S. Schiavone & C sas, via Stovigliai, 88 93015 Niscemi (CL), Italy, 3 Regional Directorate of Piedmont Museums, Ministry of Culture, Via Accademia delle Scienze, 5, 10123 Torino (TO), Italy, valentna.barberis@cultura.gov.it 4 Department of Earth and Marine Sciences (DiSTeM), University of Palermo,Via Archiraf 26 90123 Palermo (PA), Italy The rectory of Santa Maria di Vezzolano in Albugnano (Ast, Italy) was founded in 1095 AD. Between the 12th and 13th centuries the structure experienced its period of maximum magnifcence, followed by a phase of progressive decline which lasted untl 1800. In 1937 the complex was handed under the management of the Italian State and is now part of the cultural heritage sites of the Regional Directorate of Piedmont Museums, peripheral insttute of the Ministry of Culture. Among the non-invasive investgatons, geophysical methodologies were conducted to deepen the knowledge of any architectural elements under the pavement not yet detected. In partcular, ground penetratng radar (GPR) investgatons (fg. 1) with a 200/600 MHz mult-channel antenna were carried out on the internal fooring of the church and in the area in front of the façade to identfy cavites, discontnuites or underground architectural structures. Ground Penetratng Radar ( Conyers and Leckebusch, 2010; Goodman and Piro, 2013) is today a consolidated method widely used for diagnostcs and research in archaeological prospectng and in other felds of cultural heritage (Deiana et al., 2018; Cozzolino et al., 2020; Capizzi et al., 2021). All GPR profles were carried out with an interdistance of 50 centmeters and acquired using the Georadar instrumentaton of IDS – Engineering dei Sistemi S.p.a. – RIS MF HI-MOD model, equipped with a 200/600 MHz dual frequency antenna. The investgaton depths were estmated considering an average electromagnetc wave propagaton velocity of 0.1 m/ns. This average value was obtained from the slopes of the refecton hyperbolas present in the data. Each profle has been processed to eliminate coherent and inconsistent noise present in the original data. Afer processing the data with RefexW sofware (Sandmeier, 2016) trying to eliminate both coherent and inconsistent noise, we proceeded with the analysis and interpretaton in relaton to the purposes envisaged by the study. For simplicity of graphic representaton of the processed data, it was chosen to display the interpretatve models of the investgated volume, in terms of normalized refected amplitude. For each of the four areas investgated (central nave, side nave, porton in front of the Jubè, external area) a 3D model was built, using a code implemented in Matlab for the