V040-0003
COYOTES PROJECT (COMOROS & MAYOTTE: VOLCANISM, TECTONICS AND SEISMICITY)

Wednesday, 16 December 2020
Poster
Isabelle Thinon1, Anne Lemoine1, Nathalie Feuillet2, Sylvie D Leroy3, Laurent Michon4, Julia Autin5, Patrick Bachelery6, Jean Battaglia7, Julien Bernard SR1, Didier Bertil1, Pierre Briole8, Nicolas R A Chamot-Rooke9, Valerie Clouard10, Marcello de Michele1, Christine Deplus11, Cécile Doubre12, Vincent Famin13, Lucia Gurioli14, Eric Jacques15, Stephan Jorry16, Alessia Maggi17, Pauline Le Maire1, Guillaume Martelet1, Nicolas Mercury1,17, François Nauret6, Fabien Paquet1, Aurelie Peyrefitte1, Xavier Quidelleur18, Claudio Satriano19, Jean-Marie Saurel20, Daniel Sauter5, Jerome van der Woerd21,22, Sébastien Zaragosi23 and scientific COYOTES team, (1)BRGM - French geological survey, Orléans, France, (2)Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Paris, France, (3)Univ Paris 06 CNRS UMR7193, Sorbonne Univ. ISTEP, Paris, France, (4)Laboratoire GéoSciences Réunion, Institut de Physique du Globe de Paris, Université de La Réunion, Université de Paris, Saint-Denis, France, (5)Institut de Physique du Globe de Strasbourg; UMR7516, Université de Strasbourg, CNRS, Strasbourg, France, (6)University Blaise Pascal Clermont-Ferrand II, Clermont-Ferrand, France, (7)CNRS, Paris Cedex 16, France, (8)Ecole Normale Supérieure Paris, Laboratoire de Géologie, Paris, France, (9)Ecole Normale Superieure/Cnrs, Paris, France, (10)GET Géosciences Environnement Toulouse, Toulouse, France, (11)IPGP & CNRS, Paris Cedex 05, France, (12)Institut de Physique du Globe de Strasbourg, UMR 7516, Université de Strasbourg/EOST, CNRS, Strasbourg, France, (13)University of La Réunion - IPGP, Laboratoire Géosciences Réunion, Saint-Denis, France, (14)Université Clermont Auvergne, CNRS, IRD, OPGC, Laboratoire Magmas et Volcans, Aubiere, France, (15)Institut de Physique du Globe de Paris, Paris, France, (16)IFREMER, Plouzané, France, (17)Institut de Physique du Globe Strasbourg, Strasbourg Cedex, France, (18)Lab. GEOPS / University Paris-Sud, Orsay Cedex, France, (19)Institut de Physique du Globe, Paris, France, (20)Université de Paris, Institut de Physique du Globe de Paris, Paris, France, (21)University of Strasbourg, Strasbourg Cedex, France, (22)CNRS IPGS, Strasbourg Cedex, France, (23)UMR 5805 – EPOC, Université de Bordeaux, Pessac, France
Abstract:
In order to understand the unprecedented underwater telluric event of the Mayotte Seismo-Volcanic (MSV) crisis (2018-2020), it appears essential to reach a critical level of knowledge on the evolution of the seismicity, volcanic activity and geodetic deformation, but also on the geodynamic context. This includes the kinematics and the characterization of the lithospheric and crustal structures, on both short- and long-term and regional and local scales. Towards this goal, the COYOTES project aims to better understand the regional geodynamic and geological context of the north Mozambique Channel. The objectives are to understand the distribution of active and recent deformations around the Comoros Archipelago, in particular the Mayotte Island, to image the crustal structuration and to study the recent tectono-sedimentary evolution. Both the link with the East African rift system and the role of Mesozoic inherited structures in the spatial distribution of present-day deformation associated to the MSV crisis will be investigated. This updated geodynamic and geological knowledge will be used to improve the assessment of the volcanic and seismic hazards. The main work-packages are 1) Current seismic sequence, deformation and kinematics; 2) Recent and active volcanism and tectonics in the Comoros archipelago; 3) Long-term geodynamics: Regional structuration and inheritance. It will integrate new onshore and offshore acquisitions of geological and geophysical data, their interpretation as well as modelling.

The COYOTES project (2020-2024) is funded by the French National Research Agency (ANR), involving three thesis, one post-doc and more than 40 scientists from the BRGM, IPGS/EOST, IPGP, IsTep, ENS, La Réunion University, EPOC, Ifremer, SHOM, GEOPS, LMV, GET, ISTO, OVPF, ... (http://www.geocean.net/coyotes/doku.php?id=start). The project is linked with the SISMAORE oceanographic campaign that will occur on the R/V Pourquoi Pas? from December 2020 to February 2021.

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