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3-D Magnetotelluric Exploration of Tenerife Geothermal System (Canary Islands,Spain) |
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| Authors: | P Piña-Varas J Ledo P Queralt A Marcuello F Bellmunt R Hidalgo M Messeiller |
| Institution: | 1. Departament de Geodinàmica i Geofísica, Facultat de Geologia, GEOMODELS Research Institute, Universitat de Barcelona, C/Martí Franquès s/n, 08028, Barcelona, Spain 3. Spanish Geological Survey (IGME), Rios Rosas 23, 28003, Madrid, Spain 4. Instituto Volcanológico de Canarias (INVOLCAN), 38400, Puerto de la Cruz, Tenerife, Canary Islands, Spain 2. Petratherm Espa?a s.l., Avenida Italia, 8. 1°, 37006, Salamanca, Spain |
| Abstract: | The resistivity structure of the Tenerife geothermal system has been determined by the 3-D inversion of data from different magnetotelluric surveys. In this paper, the ocean and topography effects on the magnetotelluric data were investigated by constructing a 3-D conceptual geoelectrical model of the island. The study showed that these effects should be taken into account in order to obtain a reliable subsurface model of the island. Data from 148 sites were used during three-dimensional inversion. The most interesting feature in the final geoelectrical model of the geothermal system is a low resistivity structure (<10 Ωm) above the resistive core of the system. The low resistivity structure has been interpreted as a hydrothermal clay alteration cap typically generated in the conventional geothermal systems. The resistivity model has been correlated with a recent seismic velocity model, showing that a low resistivity structure surrounds an area with high P wave velocity and medium–high resistivity. This medium–high resistivity area can be associated with a slowly solidified magma and, therefore, with a hotter part of the geothermal system. |
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