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Geoelectrical and EMI Studies at an Urban Site in Buenos Aires, Argentina, for Localizing an Old TunnelNormal access

Authors: M.V. Bongiovanni, V. Grunhut, P. Martinelli, M. De La Vega and N. Bonomo
Event name: 24th European Meeting of Environmental and Engineering Geophysics
Session: Investigations of Landfills, Urban Areas & Industrial Sites A & Investigations - Seismic Hazard and Dynamic Characterization A
Publication date: 09 September 2018
DOI: 10.3997/2214-4609.201802618
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.26Mb )
Price: € 20

Summary:
We performed a geophysical study in a historical site in Buenos Aires, Argentina. The main objective was to localize and characterize an old tunnel. Considering the complex characteristics of the buried structure and the urban localization of the study area, we performed prefeasibility studies to determine the usefulness of different geophysical methods. We first applied the EMI method then the electrical resistivity tomography (ERT) method. The EMI results showed a large amount of anomalies associated to varied facilities that helped us not to do false interpretations in the ERT results. Regarding ERT results, in the three lines a resistive anomaly was found. These anomalies were aligned in the presumed direction of the tunnel. The joint inversion acquired with four different electrode spacings (a = 1, 2, 3 and 4 m) provided good lateral and vertical resolutions, as well as enough penetration depth, in which the contours of the anomaly associated to the tunnel appear fairly well delimited.


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