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Comptes Rendus Géoscience
Volume 338, n° 16
pages 1240-1249 (décembre 2006)
Doi : 10.1016/j.crte.2006.07.010
Received : 1 June 2005 ;  accepted : 24 July 2006
Bathymay : la structure sous-marine de Mayotte révélée par lʼimagerie multifaisceaux
BATHYMAY: Underwater structure of Mayotte Island revealed by multibeam bathymetry
 

Jean-Christophe Audru a, , Pol Guennoc b, Isabelle Thinon b, Olivier Abellard c
a BRGM, antenne de Mayotte, BP 1398, 97600 Mamoudzou, Mayotte 
b BRGM, CDG/MA, BP 6009, 45060 Orléans cedex 02, France 
c DAF, Service des pêches, BP 103, 97600 Mamoudzou, Mayotte 

Auteur correspondant.
Résumé

La campagne Bathymay, effectuée en 2004 à bord du N/O Marion Dufresne 2 , a permis de réaliser le premier levé bathymétrique complet de la pente insulaire de Mayotte. Lʼanalyse préliminaire de la morphologie révèle lʼexistence de nombreux canyons, de vastes déstabilisations de flancs et dʼédifices volcaniques sous-marins. Des falaises abruptes, dont certaines semblent guidées par des failles, limitent de vastes plateaux sous-marins. La campagne Bathymay a mis en évidence deux mécanismes de déstabilisation du volcan de Mayotte : la déstabilisation lente, issue de lʼeffondrement gravitaire de lʼédifice pendant le stade bouclier, puis la déstabilisation catastrophique des flancs du volcan au stade post-bouclier. Pour citer cet article : J.-C. Audru et al., C. R. Geoscience 338 (2006).

The full text of this article is available in PDF format.
Abstract

The BATHYMAY marine survey was carried out in January 2004 around the French volcanic island of Mayotte, onboard the research vessel Marion Dufresne 2 . Multibeam bathymetry revealed for the first time the morphology of the whole outer slope. Preliminary interpretations show broad canyons that deeply incise the slope, numerous volcanoes and huge landslides. Large submarine plateaus are also highlighted, bounded by steep cliffs and active normal faults. A model for Mayotte is suggested, in which eruptive activity, sometimes influenced by normal faulting, was concentrated along a N140° regional line (the Comoros archipelago axis), with landslide activity concentrated on the northeastern and southwestern flanks of this line. To cite this article: J.-C. Audru et al., C. R. Geoscience 338 (2006).

The full text of this article is available in PDF format.

Mots-clés : Bathymétrie, Imagerie, Volcans, Risques, Mayotte, Comores

Keywords : Bathymetry, Imagery, Volcanoes, Hazards, Mayotte, Comoros




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