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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