Extension active perpendiculaire à la subduction dans l'arc des Petites Antilles (Guadeloupe, Antilles françaises)
2001; Volume: 333; Issue: 9 Linguagem: Inglês
10.1016/s1251-8050(01)01543-9
ISSN1778-4107
AutoresNathalie Feuillet, Isabelle Manighetti, Paul Tapponnier,
Tópico(s)Geological formations and processes
ResumoAbstract Active normal faults cut the uplifted reef platforms of Grande-Terre and Marie-Galante and the volcanic rocks of Basse-Terre in the Lesser Antilles arc. New marine geophysical data shows that such faults extend offshore, forming two distinct sets. One set bounds graben perpendicular to the arc, attesting to ∼ north–south extension. The ‘en echelon’ faults of the other set, roughly along the volcanic arc, accommodate a component of sinistral motion. The active Soufriere volcano lies inside the western termination of the Marie-Galante graben. Historical and instrumental earthquakes with magnitude ⩾5.5 may have ruptured the Marie-Galante graben bounding faults.
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