A hydrogeological investigation using EM34 and SP surveys

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  • Santos Fernando A. Monteiro
    Departamento de Física and Centro de Geofísica da Universidade de Lisboa
  • Almeida Eugénio P.
    Departamento de Física and Centro de Geofísica da Universidade de Lisboa Instituto Politécnico de Tomar
  • Castro R.
    Departamento de Física and Centro de Geofísica da Universidade de Lisboa
  • Nolasco R.
    Departamento de Física and Centro de Geofísica da Universidade de Lisboa
  • Mendes-Victor Luís
    Departamento de Física and Centro de Geofísica da Universidade de Lisboa

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  • hydrogeological investigation using EM34 and SP surveys

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EM34 and SP surveys were used to delineate shallow structures associated with the mineral water springs in the Vilarelho da Raia area located NE Portugal. This spring is part of a set of CO2-rich mineral (hot and cold) waters connected to the main Hercynian NNE-SSW fault systems. The EM34 survey was interpreted using a quasithree-dimensional inversion approach based on a smooth-regularisation algorithm. The model put into evidence the conductive overburden as well as the fractured granitic formation. A preliminary estimation of the aquifer porosity is made based on the EM34 model. The SP anomalies were interpreted considering as having their sources on the aquifer interfaces. The modelling of two SP profiles allow the characterisation of a fault connected to the spring.

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