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Comptes Rendus. Géoscience

10 results

Lise Retailleau; Jean-Marie Saurel; Marine Laporte; Aude Lavayssière; Valérie Ferrazzini; Weiqiang Zhu; Gregory C. Beroza; Claudio Satriano; Jean-Christophe Komorowski; OVPF Team

Comptes Rendus. Géoscience, Volume 354 (2022) p. 1-18

Abstract : ... The seismic crisis that began in May, 2018 off the coast of Mayotte announced the onset of a volcanic eruption that started two months later 50 km southeast of the island. This seismicity has since been taken as an indicator of the volcanic and tectonic activity in the area. ...


Maud H. Devès; Sophie Moirand; Louise Le Vagueresse; Geoffrey Robert

Comptes Rendus. Géoscience, Volume 354 (2022) p. 1-25

Abstract : ... Mayotte’s seismo-volcanic crisis gave rise to extensive media coverage in the local, regional and national daily press. Analyzing the news narratives allows us to bring to light the representations that readers are confronted with when they try to inform themselves about the situation. ...


Marco Liuzzo; Andrea Di Muro; Andrea Luca Rizzo; Fausto Grassa; Massimo Coltorti; Magali Ader

Comptes Rendus. Géoscience, Volume 354 (2022) p. 1-24

Abstract : ... The archipelago results from intra-plate volcanism, the most recent eruptions having occurred on the youngest island of Grande Comore and on the oldest one of Mayotte. Since 2018, the eastern submarine flank of Mayotte has been the site of one of the largest recent eruptive events on Earth in terms of erupted lava volume. On land, the most recent volcanic activity occurred in Holocene on the eastern side of Mayotte, corresponding to the small Petite Terre Island, where two main and persistent gas seep areas are present (Airport Beach, namely BAS, and Dziani Dzaha intracrateric lake). ...


Pablo Poulain; Anne Le Friant; Rodrigo Pedreros; Anne Mangeney; Andrea G. Filippini; Gilles Grandjean; Anne Lemoine; Enrique D. Fernández-Nieto; Manuel J. Castro Díaz; Marc Peruzzetto

Comptes Rendus. Géoscience, Volume 354 (2022) p. 1-30

Abstract : ... We investigate 8 landslide scenarios (volumes from $11.25 \times 10^6~\text{m}^3$ to $800 \times 10^6~\text{m}^3$). The scenario posing the greatest threat involves destabilization on the eastern side of Mayotte’s lagoon at a shallow depth and can generate sea-surface deformations of up to 2 m. We show that the barrier reef surrounding Mayotte plays a prominent role in controlling water-wave propagation and in protecting the island. ...


Didier Bertil; Nicolas Mercury; Cécile Doubre; Anne Lemoine; Jérôme Van der Woerd

Comptes Rendus. Géoscience, Volume 353 (2021) p. 211-235

Abstract : ... The Mayotte seismic sequence that started on 10 May 2018, with a main shock of magnitude Mw 5.9 on May 15, followed by a major offshore volcanic activity, raises several questions of seismo-volcanic hazards in the Comoros region. ...


Gérard Sarazin; Didier Jézéquel; Christophe Leboulanger; Eric Fouilland; Emilie Le Floc’h; Marc Bouvy; Emmanuelle Gérard; Hélène Agogué; Cécile Bernard; Mylène Hugoni; Vincent Grossi; Marc Troussellier; Magali Ader

Comptes Rendus. Géoscience, Volume 352 (2020) p. 559-577

Keywords : ... Thalassohaline lake, Endorheic ecosystem, Cyanobacteria, Methane emission, Biogeochemistry, Mayotte ...


Catalina Morales-Yáñez; Zacharie Duputel; Luis Rivera

Comptes Rendus. Géoscience, Volume 354 (2022) p. 1-16

Abstract : ... The archipelago of Comoros was generally considered a moderately seismic region. However, since May 2018, unusual seismicity has been observed off the east coast of Mayotte Island. Following this increase of seismic activity, oceanographic campaigns led to the discovery of a new submarine volcano, indicating that the observed seismicity had a volcanic origin. In this study, we estimate Centroid Moment Tensor (CMT) solutions of $M_w\ge 5$ earthquakes of this sequence using 3D Green’s functions and analyze their non-double-couple (non-DC) components. ...


Miki Mori

Comptes Rendus. Géoscience, Volume 354 (2022) p. 1-21

Abstract : ... The earthquake swarm that struck Mayotte in 2018 incited panic and various reactions among the local population. Because earthquakes are rare on the island, people were beside themselves, with many leaving their homes to wait out the night under the open air. ...


Frédéric Masson; Carole Petit; Stéphane Mazzotti

Comptes Rendus. Géoscience, Volume 353 (2021) p. 1-4

Full text : ... The deadly earthquakes in Italy (2009, Mw 6.1 L’Aquila; 2016 Mw 6.0 Amatrice and Mw 6.5 Norcia) and the recent seismicity crises in Mayotte, Le Teil and Strasbourg have reminded us that seismicity is a non-negligible natural hazard for our country. Moreover, new technical and theoretical advances have recently challenged the classical understanding of the link between seismicity and crustal deformation in France [Masson et al. 2019; Henrion et al. 2020] and elsewhere [Craig and Calais 2014]. ...


Christophe Sira; Michel Cara; Antoine Schlupp; Frédéric Masson; Marc Schaming; Véronique Mendel

Comptes Rendus. Géoscience, Volume 353 (2021) p. 23-51

Full text : ... Stopped in 2016, this application will be replaced by an adaptive multi-platform system.In the French West Indies, since Les Saintes Earthquake in 2004 [Cara et al. 2005], the “Observatoire sismologique et volcanologique de Guadeloupe” and the “Observatoire sismologique et volcanologique de Martinique” of “Institut de Physique du Globe de Paris” systematically relays the calls for individual testimonies, as well as for communal surveys requested by the governmental regional authorities.In Mayotte, Indian Ocean, REVOSIMA (Réseau de surveillance volcanologique et sismologique de Mayotte), created after the volcano-seismic crisis that started in June 2018, now helps to relay the calls for individual testimonies. ...