Active faulting induced by slip partitioning in Montserrat and link with volcanic activity: New insights from the 2009 GWADASEIS marine cruise data | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Active faulting induced by slip partitioning in Montserrat and link with volcanic activity: New insights from the 2009 GWADASEIS marine cruise data

Type de publication:

Journal Article

Source:

Geophysical Research Letters, Volume 37, p.L00e15 (2010)

ISBN:

0094-8276

Numéro d'accès:

ISI:000277253000002

URL:

http://www.agu.org/pubs/crossref/2010/2010GL042556.shtml

Mots-clés:

UMR 7154 ; Tectonique ; N° Contribution : 2634 ; Montserrat ; seismic hazard ; active faulting

Résumé:

New high-resolution marine data acquired aboard R/V Le Suroit was used to map active normal faults offshore Montserrat in greater detail. The main faults of the Montserrat-Havers fault zone have cumulative scarps up to 200 m high, and offset sedimentary layers by hundreds of meters. They are arranged in a right-stepping, en echelon, trans-tensional array, which confirms that they accommodate the left-lateral component of motion resulting from slip partitioning of oblique convergence along the volcanic arc. They cut across Montserrat's recent volcanic complex. Faulting and fissuring exerted control on the position of andesitic domes, which are aligned along the N110 degrees E average fault trend. The approximate to 10 km-long fault segments that cross the island could produce damaging, M approximate to 6 events comparable to the shallow, 16 March 1985, Mw similar to 6.3 earthquake that ruptured a submarine, N140 degrees E striking, left-lateral fault near Redonda. Citation: Feuillet, N., et al. (2010), Active faulting induced by slip partitioning in Montserrat and link with volcanic activity: New insights from the 2009 GWADASEIS marine cruise data, Geophys. Res. Lett., 37, L00E15, doi: 10.1029/2010GL042556.

Notes:

Feuillet, Nathalie Leclerc, Frédérique Tapponnier, Paul Beauducel, Francois Boudon, Georges Le Friant, Anne Deplus, Christine Lebrun, Jean-Frédéric Nercessian, Alexandre Saurel, Jean-Marie Clément, Valentin