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Volcanic monitoring of the 2021 LaPalma eruption using long‑period magnetotelluric data

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Bibliographic Details
Title: Volcanic monitoring of the 2021 LaPalma eruption using long‑period magnetotelluric data
Authors: Piña-Varas, Perla, Ledo Fernández, Juanjo, Queralt i Capdevila, Pilar, Martínez Van Dorth, David, Marcuello Pascual, Alejandro, Cabrera-Pérez, Iván, D’Auria, L., Martí i Castells, Anna
Source: Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
Publisher Information: Nature Publishing Group
Publication Year: 2023
Collection: Dipòsit Digital de la Universitat de Barcelona
Subject Terms: Volcans, Prospecció magnetotel·lúrica, Palma (Canàries), Erupcions volcàniques, Volcanoes, Magnetotelluric prospecting, Palma (Canary Islands), Volcanic eruptions
Description: Between September and December 2021, the frst subaerial volcanic eruption in the Canary Islands in 50 years took place on the island of La Palma. Since November 2021, we have been conducting a long-period magnetotelluric (MT) monitoring experiment at a site located 2.4 km east of the volcanic cone. Having continuously recorded data since then, the obtained dataset shows signifcant changes in resistivity over the fourteen months following the eruption: more than± 20% in apparent resistivity and± 2 degrees in phase. These temporal variations in electrical resistivity, recorded continuously using long-period MT during both the syn- and post-eruptive stages, have not been reported to date, making this dataset unique. Four estimated impedances have been selected as representatives of the major temporal changes observed and inverted to generate new 3-D resistivity models. The results provide novel key information on the spatiotemporal evolution of the subsoil’s electrical resistivity, enabling the characterization of a set of structures acting as preferred magmatic fuid pathways. Therefore, our study highlights the strong potential of MT as a volcanic monitoring tool and provides new insights about the evolution of the fuid pathways during the post-eruptive stage. These fndings enhance our understanding of the magmatic system and may contribute to volcanic hazard mitigation in the future.
Document Type: article in journal/newspaper
File Description: 10 p.; application/pdf
Language: English
Relation: Reproducció del document publicat a: https://doi.org/https://doi.org/10.1038/s41598-023-43326-0; Scientific Reports, 2023, vol. 13; https://doi.org/https://doi.org/10.1038/s41598-023-43326-0; https://hdl.handle.net/2445/208150; 739502
Availability: https://hdl.handle.net/2445/208150
Rights: cc-by (c) P. Piña‑Varas et al., 2023 ; http://creativecommons.org/licenses/by/4.0/ ; info:eu-repo/semantics/openAccess
Accession Number: edsbas.C1C610F4
Database: BASE
Description
Abstract:Between September and December 2021, the frst subaerial volcanic eruption in the Canary Islands in 50 years took place on the island of La Palma. Since November 2021, we have been conducting a long-period magnetotelluric (MT) monitoring experiment at a site located 2.4 km east of the volcanic cone. Having continuously recorded data since then, the obtained dataset shows signifcant changes in resistivity over the fourteen months following the eruption: more than± 20% in apparent resistivity and± 2 degrees in phase. These temporal variations in electrical resistivity, recorded continuously using long-period MT during both the syn- and post-eruptive stages, have not been reported to date, making this dataset unique. Four estimated impedances have been selected as representatives of the major temporal changes observed and inverted to generate new 3-D resistivity models. The results provide novel key information on the spatiotemporal evolution of the subsoil’s electrical resistivity, enabling the characterization of a set of structures acting as preferred magmatic fuid pathways. Therefore, our study highlights the strong potential of MT as a volcanic monitoring tool and provides new insights about the evolution of the fuid pathways during the post-eruptive stage. These fndings enhance our understanding of the magmatic system and may contribute to volcanic hazard mitigation in the future.