Site effects observations and mapping on the weathered volcanic formations of Mayotte Island

Agathe Roullé; Marie Baillet; Didier Bertil; Cécile Cornou

Comptes Rendus. Géoscience, Volume 354 (2022) p. 317-341

Résumé : ... Depuis les années 2000, les études d’aléa sismique local réalisées à Mayotte ont montré que les formations géologiques superficielles présentes sur l’île étaient susceptibles de présenter des effets de site lithologiques. La séquence sismique initiée en mai 2018 a confirmé l’importance de ces effets, aussi bien en termes d’intensité que d’étendue spatiale. ...

Seismic damage scenarios for Mayotte: a tool for disaster management

Nicolas Taillefer; Didier Bertil; Caterina Negulescu; Agathe Roullé; Christian Iasio; Samuel Auclair; Robin Quique

Comptes Rendus. Géoscience, Volume 354 (2022) p. 343-359

Résumé : ... A new marine volcano is erupting offshore Mayotte since May 2018, generating numerous earthquakes. The population felt many of them and the stronger shaking of the ongoing sequence caused slight damage to buildings. Historical records also confirm that damaging earthquakes had occurred in the past in this region. ...

The unexpected Mayotte 2018–2020 seismic sequence: a reappraisal of the regional seismicity of the Comoros

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

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

Résumé : ... 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. ...

Onset of a submarine eruption east of Mayotte, Comoros archipelago: the first ten months seismicity of the seismo-volcanic sequence (2018–2019)

Nicolas Mercury; Anne Lemoine; Cécile Doubre; Didier Bertil; Jérôme Van Der Woerd; Roser Hoste-Colomer; Jean Battaglia

Comptes Rendus. Géoscience, Volume 354 (2022) p. 105-136

Résumé : ... From 10 May 2018 to 1 November 2022 (time of writing), an unprecedented seismic activity is observed east of Mayotte Island (France), related to the largest submarine eruption ever recorded with offshore geophysical studies. Using signals from regional and local seismic stations, we build a comprehensive catalog of the local seismicity for the first ten months of the sequence. ...