GNGTS 2016 - Atti del 35° Convegno Nazionale

558 GNGTS 2016 S essione 3.2 mapping active faults, sinkholes, voids etc.. in complex urban environments: a critical review of results obtained in many urban areas of Italy is presented. Finally, the first preliminary results of a geophysical field survey carried in the historical center of Matera will be illustrated and discussed. Acknowledgements. This project is supported by Italian Ministry of Education, University and Research in the frame of a national call on the topic “Smart Cities &Communities”. The partners of the project thank the Municipalities of Ferrara and Matera and the Civil Protection of Enna Province for their support to the project activities. References Giocoli A, Galli P, Giaccio B, Lapenna V., Messina P, Peronace E, Romano G, Piscitelli S (2011). Electrical Resistivity Tomography across the Paganica-San Demetrio fault system (L’Aquila 2009 earthquake). BOLLETTINO DI GEOFISICA TEORICA E APPLICATA, vol. 52; p. 457-469, (2011). Giocoli A., Quadrio B., Bellanova J., Lapenna V., Piscitelli S. . Electrical resistivity tomography for studying liquefaction induced by the May 2012 Emilia-Romagna earthquake (Mw=6.1, northern Italy). NATURAL HAZARDS AND EARTH SYSTEM SCIENCES, vol. 14; p. 731-737, (2014). Piscitelli S, Rizzo E, Cristallo F, Lapenna V., Crocco L, Persico R, Soldovieri F. GPR and microwave tomography for detecting shallow cavities in the historical area of “Sassi of Matera” (southern Italy). NEAR SURFACE GEOPHYSICS, vol. 5; p. 275-284, (2007). Showstack R. Scientists Call for a Renewed Emphasis on Urban Geology. EOS Earth & Space Science News, (November, 2014). Stabile, T.A., Perrone, A., Gallipoli, M.R., Di Tommaso, R., Ponzo, F.C. Dynamic survey of the Musmeci Bridge by joint application of Ground-Based Microwave Radar Interferometry and Ambient Noise Standard Spectral Ratio techniques. IEEE GEOSCIENCE AND REMOTE SENSING LETTERS, Vol.10, pp.870-874, (2013). The Roman Bath, in Sagalassos (Turkey): Study of stability using integrated geophysical and laser scanner surveys D. Malfitana, G. Leucci, A. Mazzaglia, G. Cacciaguerra, L. De Giorgi, S. Barone, G. Fragalà, D. Pavone, S. Russo Istituto per i Beni Archeologici e Monumentali – CNR, Lecce, Italy Introduction. The researches carried out by the IBAM-CNR in the area of Roman Bath at the archaeological site of Sagalassos (Ağlasun -Turkey) have led to create an innovative system for the documentation, representation and preservation of archaeological contexts. The scientific rigour and precision of the traditional instrumental mapping together with the use of new technologies and geophysical methods have produced high- definition 3D models of the monument as tools to store and manage scientific information. For geophysical survey two physical parameters were measured, the electrical resistivity and self potential in order to obtain their distribution in a three-dimensional volume. The aim of geophysical survey was to obtain information about the roman bath structure stability. Results and discussion. With the aim investigate the integrity of the Roman Bath structure, the ERT survey was conducted in an area 78 m x 127 m (Fig. 1a). Fig. 1b shows the electrical resistivity model at six different depths. It is possible to note a low resistivity zone (10-60 Ωm) probably linked to the presence of a flow of water coming from the north. Part of water flow is directed towards the thermal baths and it spreads within them. It is possible also to evidence the fault line that crosses the baths. The 3D images of electrical resistivity can easily be visualized by 3D contouring of iso-resistivity volumes (Fig. 1c). In Fig. 1c, the ρ data set is displayed with iso-ρ volumes using two threshold values ranging respectively from 1500 to 2000 Ωm and from 10 to 60 ohm m. This kind of visualization allows to emphasize both the bedrock variation depth (ranging from about 5m to about 12m in depth)