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Integrated Geophysical Surveys in the Tarragona CathedralNormal access

Authors: P.L. Cosentino, A. Casas, P. Capizzi, Y. Diaz, G. Fiandaca, E. Garcia, M. Himi, R. Martorana and R. Sala
Event name: Near Surface 2009 - 15th EAGE European Meeting of Environmental and Engineering Geophysics
Session: Archeo and Forensic Geophysics
Publication date: 07 September 2009
DOI: 10.3997/2214-4609.20146991
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.11Mb )
Price: € 20

Summary:
An integrated geophysical survey has been conducted at the Tarragona’s Cathedral (Catalonia, NE Spain) with the aim to detect the existence of archaeological remains of the Roman’s temple devoted to August. Many hypotheses have been proposed about its possible location, the last ones regarding the inner part of the Cathedral, which is one of the most famous temple of Spain (12th century) evolving from Romanesque to Gothic styles. A project including electrical resistivity tomography (ERT), ground probing radar (GPR) and frequency domain electromagnetics (FDEM) has been planned over one year and conducted during a week of intensive field survey. From all the methods applied, both ERT and GPR have provided some detailed information on subsoil structures. The ERT method has been applied with different techniques and arrays, ranging from standard Wenner-Schlumberger 2D sections to full 3D electrical imaging using the MYG array. Electrical resistivity data have been recorded extensively and therefore, 70.000 apparent resistivity data were available to obtain a full 3D image after an integrated inversion. In conclusion, some significant buried structures have been revealed providing conclusive information for archaeologists.


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