학술논문
Ground deformation monitoring of the eruption offshore Mayotte
Document Type
article
Author
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
Source
Comptes Rendus. Géoscience, Vol 354, Iss S2, Pp 171-193 (2022)
Subject
Language
English
French
French
ISSN
1778-7025
24141224
24141224
Abstract
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.