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Beck, C.; Reyss, J-l; Leclerc, F.; Moreno, E.; Feuillet, Nathalie; Barrier, L.; Beauducel, F.; Boudon, G.; Clement, V.; Deplus, Christine; Gallou, N.; Lebrun, J-f; Le Friant, A.; Nercessian, A.; Paterne, M.; Pichot, Thibaud; Vidal, C.. |
During the GWADASEIS cruise (Lesser Antilles volcanic arc, February-March 2009) a very high resolution (VHR) seismic-reflection survey was performed in order to constrain Late Quaternary to Present faulting. The profiles we obtained evidence frequent "ponding" of reworked sediments in the deepest areas, similar to the deposition of Mediterranean "homogenites". These bodies are acoustically transparent (few ms t.w.t. thick) and are often deposited on the hanging walls of dominantly normal faults, at the base of scarps. Their thickness appears sufficient to compensate (i.e. bury) co-seismic scarps between successive earthquakes, resulting in a flat and horizontal sea floor through time. In a selected area (offshore Montserrat and Nevis islands), piston... |
Tipo: Text |
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Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00089/20040/21990.pdf |
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