Ground deformation monitoring of the eruption offshore Mayotte

In May 2018, the Mayotte island, located in the Indian Ocean, was affected by an unprecedented seismic crisis, followed by anomalous on-land surface displacements in July 2018. Cumulatively from July 1, 2018 to December 31, 2021, the horizontal displacements were approximately 21 to 25 cm eastward,...

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Bibliographic Details
Published in:	Comptes rendus. Geoscience Vol. 354; no. S2; pp. 171 - 193
Main Authors:	Peltier, Aline, Saur, Sébastien, Ballu, Valérie, Beauducel, François, Briole, Pierre, Chanard, Kristel, Dausse, Denis, De Chabalier, Jean-Bernard, Grandin, Raphael, Rouffiac, Perrine, Tranchant, Yann-Treden, de Berc, Maxime Bès, Besançon, Simon, Boissier, Patrice, Broucke, Céleste, Brunet, Christophe, Canjamalé, Kevin, Carme, Erwan, Catherine, Philippe, Colombain, Alison, Crawford, Wayne, Daniel, Romuald, Dectot, Grégoire, Desfete, Nicolas, Doubre, Cécile, Dumouch, Tom, Griot, Cyprien, Grunberg, Marc, Jund, Hélène, Kowalski, Philippe, Lauret, Frédéric, Lebreton, Jacques, Pesqueira, Frédérick, Tronel, Frédéric, Valty, Pierre, van der Woerd, Jérôme
Format:	Journal Article
Language:	English
Published:	Paris Académie des Sciences. Institut de France 01-01-2022 Académie des sciences (Paris) Académie des sciences
Subjects:	Earth Sciences Earthquakes Fani Maoré GNSS GRACE modeling Joint inversion Mayotte Ocean bottom Pressure gauge Pressure gauges Sciences of the Universe Subsidence Volcano deformation Volcanoes Volcanology Pressure gauge Fani Maoré Modélisation GRACE Déformation volcanique GRACE modeling GNSS Mayotte Capteur de pression Volcano deformation Joint inversion Inversion jointe
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Summary:	In May 2018, the Mayotte island, located in the Indian Ocean, was affected by an unprecedented seismic crisis, followed by anomalous on-land surface displacements in July 2018. Cumulatively from July 1, 2018 to December 31, 2021, the horizontal displacements were approximately 21 to 25 cm eastward, and subsidence was approximately 10 to 19 cm. The study of data recorded by the on-land GNSS network, and their modeling coupled with data from ocean bottom pressure gauges, allowed us to propose a magmatic origin of the seismic crisis with the deflation of a deep source east of Mayotte, that was confirmed in May 2019 by the discovery of a submarine eruption, 50 km offshore of Mayotte ([Feuillet et al., 2021]). Despite a non-optimal network geometry and receivers located far from the source, the GNSS data allowed following the deep dynamics of magma transfer, via the volume flow monitoring, throughout the eruption.
ISSN:	1778-7025 1631-0713 1778-7025
DOI:	10.5802/crgeos.176