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Title: La Palma island (Spain) geothermal system revealed by 3D magnetotelluric data inversion
Author: Di Paolo, Federico
Ledo Fernández, Juanjo
Slezak, Katarzyna
van Dorth, David Martinez
Cabrera-Perez, Ivan
Perez, Nemesio
Keywords: Electromagnetisme
Prospecció magnetotel·lúrica
Energia geotèrmica
Palma (Canàries)
Magnetotelluric prospecting
Geothermal resources
Palma (Canary Islands)
Issue Date: 23-Oct-2020
Publisher: Nature Publishing Group
Abstract: The study of geothermal systems is nowadays a topic of great importance because of the huge amount of energy that could be converted in electricity for human consumption from such sources. Among the various geophysical methods employed to study geothermal reservoirs, the magnetotelluric (MT) method is capable to reveal the internal structures of the subsurface and interpret the geological structures from the electrical resistivity. We present the frst 3D resistivity model of La Palma (Canary archipelago, Spain) obtained from a dataset of 44 broadband magnetotelluric soundings distributed around the island. Our results highlight the presence of resistivity anomalies, spatially coinciding with density anomalies present in literature. In the north of the island, a high resistivity anomaly can be interpreted as the signature of an old intrusive body beneath the Taburiente caldera. In the south, a complex resistivity structure around the Cumbre Vieja volcanic ridge could be indicative of presence of an active geothermal system. In particular, low-resistivity anomalies, located in a high-fractured zone, have values compatible with clay alteration caps (illite and illite-smectite). Such a result suggests the presence of hot rocks, or a dike system, heating fuids in the interior of Cumbre Vieja volcanic system.
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It is part of: Scientific Reports, 2020, vol. 10, num. 18181
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ISSN: 2045-2322
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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