Contribution of Ground Penetrating Radar and Electrical Resistivity Tomography to identify the cavity and fractures under the main Church in Botrugno (Lecce, Italy)
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Subsoil
Ground-Penetrating Radar
Electrical Resistivity Tomography
The Resolution of Lithological Contacts through the Interpretation of Electrical Tomography Profiles
The use of geophysical techniques as method for examining the subsoil has increased last decades. Probably, Electrical Tomography is the most versatile method of geophysical prospecting for making analyses of subsoil and it allows to work with variable depths and to carry out a lot of objectives.It is necessary to do a very simple and easy procedure for obtaining resistivity images of subsoil; nevertheless it is very difficult and complex to interpret them. In this case, the study is focus in the applicability of Electrical Tomography in the determination of lithological contacts by means of the interpretation of electrical tomography profiles. This abstract presents the experimentation that shows how with a correct interpretation of the electrical tomography profiles can be deduce from the surface, in a non-destructive way, the location, the depth and the approximate size of every material that make up the subsoil.
Subsoil
Electrical Resistivity Tomography
Prospecting
Geophysical prospecting
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Subsoil
Ground-Penetrating Radar
Electrical Resistivity Tomography
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Subsoil
Electrical Resistivity Tomography
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Ongoing and extensive urbanisation, which is frequently accompanied with careless construction works, may threaten important archaeological structures that are still buried in the urban areas. Ground Penetrating Radar (GPR) and Electrical Resistivity Tomography (ERT) methods are most promising alternatives for resolving buried archaeological structures in urban territories. In this work, three case studies are presented, each of which involves an integrated geophysical survey employing the surface three-dimensional (3D) ERT and GPR techniques, in order to archaeologically characterise the investigated areas.The test field sites are located at the historical centres of two of the most populated cities of the island of Crete, in Greece. The ERT and GPR data were collected along a dense network of parallel profiles. The subsurface resistivity structure was reconstructed by processing the apparent resistivity data with a 3D inversion algorithm. The GPR sections were processed with a systematic way, applying specific filters to the data in order to enhance their information content. Finally, horizontal depth slices representing the 3D variation of the physical properties were created. The GPR and ERT images significantly contributed in reconstructing the complex subsurface properties in these urban areas. Strong GPR reflections and high-resistivity anomalies were correlated with possible archaeological structures. Subsequent excavations in specific places at both sites verified the geophysical results. The specific case studies demonstrated the applicability of ERT and GPR techniques during the design and construction stages of urban infrastructure works, indicating areas of archaeological significance and guiding archaeological excavations before construction work.
Ground-Penetrating Radar
Electrical Resistivity Tomography
Geophysical survey
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