GNGTS 2017 - 36° Convegno Nazionale

GNGTS 2017 S essione 3.2 635 Socco, L. V. and C. Comina, 2017, Time-average velocity estimation through surface-wave analysis: Part 2 — P-wave velocity: Geophysics, 82(3), U61-U73. Socco, L. V., S. Foti, and D. Boiero, 2010, Surface wave analysis for building near surface velocity models: established approaches and new perspectives: Geophysics, 75(5), 75A83–75A102, doi: 10.1190/1.3479491. Socco, L. V., Boiero, Daniele, 2008, Improved Monte Carlo inversion of surface wave data: Geophysical Prospecting. 56(3), doi: 10.1111/j.1365-2478.2007.00678.x Teodor, D., Comina, C., Socco, L.V. , Brossier, R., Trinh P. T. & Virieux, J. (2017) - Initial Model Design for Full- Waveform Inversion - Preliminary Elastic Modelling from Surface Waves Data Analysis . In. 36th GNGTS Nat. Conv. GPR and magnetic survey at the Kamarina archaeological site (Sicily, Italy) supported by aerial photographic and thermographic data R. Martorana 1,2 , P. Capizzi 1 , A. D’Alessandro 2 , A. Pisciotta 3 , S. Scudero 2 1 Dip. di Scienze della Terra e del Mare, Università degli Studi di Palermo, Italy 2 Istituto Nazionale di Geofisica e Vulcanologia, Centro Nazionale Terremoti, Italy 3 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, Italy Archaeological information. Kamarina was a Greek city founded by the Siracusans at the beginning of the 6th century BC. (598-597 BC) on a plateau (ca. 50 m a.s.l.) delimited by the Ippari and Oanis rivers, located along the southern coast of Sicily (Italy). During the 5th century BC., Kamarina acquired floridity and prestige and at the end of the 4th century B.C. it reached its maximum urban expansion. As early as the 3rd century BC, conquered by the Romans (258 BC), the city started to decay until it declined in the imperial age. Kamarina was definitively destroyed in 827 during the Arab conquest of Sicily. The present remains are of great archaeological interest, and consists of archaic tombs (VII century BC) and the acropolis with ruins of a temple dedicated to Athena, successively embedded in the construction of the church of Our Lady of Cammarana. The building was destroyed by a fire in 1873; its remains were used for the construction of the farmhouse that hosts the local museum today. At present, remains of civil and public buildings have been uncovered in the small portions of the whole archaeological site that have been investigated. At the top of the hill, there are visible the ruins of the Temple of Athena, explored by Orsi from 1896 to 1911 and Pelagatti (1985). The Agora is located on the south-western end of the hill, between the temple of Athena and the harbour. Its excavations have not been fully completed. Since the importance of the site in the Greek period, archeologists supposed the possible presence of notable structure (i.e. a theatre), but any observable morphological evidence did not support such a hypothesis. Preliminary multidisciplinary geophysical investigations involving Ground Penetrating Radar (GPR) and magnetic survey (Chianese et al. , 2004; Rizzo et al. , 2005; Ranieri et al. , 2016), supported by 3D photogrammetry and UAV thermography were performed in a sector adjacent to the Agora aimed to find any clues that could address the future archaeological excavations. Terrestrial geophysical surveys involved an area of approximately 2500 m 2 , overlapping the same zones in order to constrain the interpretation. Aerial surveys were instead performed over about the whole archeological site. Aerial survey. An aerial photographic and thermographic survey was performed in order to produce a high resolution digital surface model (DSM) and a thermal map of the archaeological site, contributing to a reconstructive history of architectural structures. The system consists a lightweight (1.1 kg) UnmannedAerial Vehicle (UAV) equipped with an on-board digital camera, GPS and autopilot system. We used a quadricopter Phantom 3 Dji, well suited photogrammetry