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3-D Magnetotelluric Exploration of Tenerife Geothermal System (Canary Islands, Spain)

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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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Acknowledgments

The authors sincerely thank the Editor in chief M. J. Rycroft and the three anonymous reviewers for their useful comments. This work was funded by the projects “GEOTHERCAN: Desarrollo experimental de modelos 3D para la caracterización de yacimientos geotérmicos en el subsuelo de Canarias mediante el uso y la aplicación combinada de métodos geofísicos, geoquímicos y geológicos” (IPT-2011-1186-920000) and “PIER- CO2” (CGL2009-07604) of the Ministerio de Ciencia e Innovación. The authors also wish to acknowledge to J. De la Puente from Repsol-BSC Research Centre for his technical support. We also thank ITER (Instituto Tecnológico y de Energías Renovables de Tenerife) for field support. Gary Egbert is thanked for providing the ModEm code. Xenia Ogaya is thanked for her useful comments. Perla Piña-Varas was supported by the Spanish Geological Survey (IGME).

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  1. Departament de Geodinàmica i Geofísica, Facultat de Geologia, GEOMODELS Research Institute, Universitat de Barcelona, C/Martí Franquès s/n, 08028, Barcelona, Spain

    P. Piña-Varas, J. Ledo, P. Queralt, A. Marcuello & F. Bellmunt

  2. Petratherm España s.l., Avenida Italia, 8. 1°, 37006, Salamanca, Spain

    R. Hidalgo & M. Messeiller

  3. Spanish Geological Survey (IGME), Rios Rosas 23, 28003, Madrid, Spain

    P. Piña-Varas

  4. Instituto Volcanológico de Canarias (INVOLCAN), 38400, Puerto de la Cruz, Tenerife, Canary Islands, Spain

    J. Ledo

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10712_2014_9280_MOESM1_ESM.zip

Supplementary material 1 Observed apparent resistivity and phase compared with the response of the 3-D final model (Fig. 8, 9 and 10). Sites TENxxx and sites xx corresponds to 2009 and 2012 survey. Sites Oxx, Nxx, Dxx and sites xxx corresponds to 1987 and 1991 surveys respectively. (ZIP 17391 kb)

10712_2014_9280_MOESM2_ESM.tif

Supplementary material 2 Sensitivity test carried out against the MH body. a) The final model was replaced by a homogeneous layer of 130 Ωm from -540 m a.s.l to the bottom of the model. b) Apparent resistivity pseudosections showing the difference between the final model response and the modified model (MH_1). The data set was projected in a N80E direction profile (see Fig. 4a for location). T: Teide. (TIFF 2411 kb)

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Piña-Varas, P., Ledo, J., Queralt, P. et al. 3-D Magnetotelluric Exploration of Tenerife Geothermal System (Canary Islands, Spain). Surv Geophys 35, 1045–1064 (2014). https://doi.org/10.1007/s10712-014-9280-4

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