Scientific response to the 2021–2022 seismic swarm in the Monts Dore volcanic province (France): dynamic insights from temporal surveys (2/2)

During years 2021–2022, an unusual seismic swarm was recorded at crustal level beneath the Monts Dore volcanic province (France). Complementary field and remote measurements were performed. Together with the time series recorded on the seismological and GNSS national networks, these measurements were fundamental for monitoring the evolution of the seismic swarm and deciphering its origin. Although a potential vertical migration of the seismic events is suggested, the complementary measurements presumably discard the hypothesis of magma intrusion at shallow crustal level. The ascent of a CO 2 -rich fluid originating from the mantle might instead have reacted with the hydrothermal system beneath the Monts-Dore since at least the summer 2021 leading to the reactivation of pre-existing tectonic structures with known associated seismicity. Feedback on the management of the 2021–2022 seismic swarm prompts for several recommendations that should be considered in future to better face and address at the national level the issues raised at long-dormant volcanic provinces in mainland France.

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Publication Details

Journal
Comptes Rendus Géoscience
Published
2025-05-05
DOI
https://doi.org/10.5802/crgeos.285
Citations
2
Primary Topic
earthquake and tectonic studies
Type
article
Field-Weighted Citation Impact
3.73

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article

Scientific response to the 2021–2022 seismic swarm in the Monts Dore volcanic province (France): dynamic insights from temporal surveys (2/2)

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earthquake and tectonic studies
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article

Scientific response to the 2021–2022 seismic swarm in the Monts Dore volcanic province (France): dynamic insights from temporal surveys (2/2)

Luca Terray, Charley Merciecca, Pierre‐Jean Gauthier, Vincent Breton, Lydie Gailler, Lucia Gurioli, Andrea Luca Rizzo, Cristina Trull-Hernandis, Marianne Métois, Martial Bontemps, Benjamín van Wyk de Vries, Danielle Briot, Edouard Regis, Nicola Genzano, Francesco Marchese, Philippe Labazuy, Fausto Grassa, Aude Beauger, Valerio Tramutoli, E. Delage, Catherine Deniel, Lisa Ricci, Victoria Rafflin, Olivier Voldoire, Étienne Médard, Guillaume Boudoire, Didier Laporte, Valérie Cayol, Francesco Frondini, Gilles Mazet‐Roux, Patrick Fréville, Erwan Thébault, Yannick Guéhenneux, Jean‐Luc Devidal, Philippe Cacault, Valérie Bosse, Nicola Pergola, Giuseppe M. Campo, Nicolas Cluzel, M. Pouget, Jean Battaglia, Manfredi Longo, Jean-Michel Douchain, Marc Grunberg, Andrew Harris, Clément Grace, Thierry Souriot, Alexandre Faissal
article en
2 citations

Abstract

During years 2021–2022, an unusual seismic swarm was recorded at crustal level beneath the Monts Dore volcanic province (France). Complementary field and remote measurements were performed. Together with the time series recorded on the seismological and GNSS national networks, these measurements were fundamental for monitoring the evolution of the seismic swarm and deciphering its origin. Although a potential vertical migration of the seismic events is suggested, the complementary measurements presumably discard the hypothesis of magma intrusion at shallow crustal level. The ascent of a CO 2 -rich fluid originating from the mantle might instead have reacted with the hydrothermal system beneath the Monts-Dore since at least the summer 2021 leading to the reactivation of pre-existing tectonic structures with known associated seismicity. Feedback on the management of the 2021–2022 seismic swarm prompts for several recommendations that should be considered in future to better face and address at the national level the issues raised at long-dormant volcanic provinces in mainland France.

Comptes Rendus GéoscienceVol. 357(G1)
Université Claude Bernard Lyon 1 (FR), École Normale Supérieure de Lyon (FR), Centre National de la Recherche Scientifique (FR), Royal Holloway University of London (GB), Université Clermont Auvergne (FR), University of Basilicata (IT), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), University of Perugia (IT), Istituto Nazionale di Geofisica e Vulcanologia (IT), Laboratoire de Géographie Physique et Environnementale (FR), Institute of Geosciences and Earth Resources (IT), CEA DAM Île-de-France (FR), University of Clermont Auvergne (FR), Observatoire de Physique du Globe de Clermont-Ferrand (FR), CNR-IMIOT – Consiglio Nazionale delle Ricerche - Istituto di Metodologie Integrate per l’Osservazione della Terra (IT), Laboratoire Magmas et Volcans (FR), Clermont Université (FR), Laboratoire de Géologie de Lyon : Terre, Planètes et Environnement (FR), Institut de Recherche pour le Développement (FR), Universitat Politècnica de València (ES), Université de Limoges (FR), University of Milano-Bicocca (IT), Université de Strasbourg (FR), Université Jean Monnet (FR), Politecnico di Milano (IT)
Agence Nationale de la Recherche, Istituto Nazionale di Geofisica e Vulcanologia, Université Clermont-Auvergne, European Regional Development Fund
Life below water
Openalex Percentile: Top 9%
earthquake and tectonic studies
3.73
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