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GEOPHYSICAL RESEARCH LETTERS,
VOL. 32,
L04311,
5 PP., 2005
doi:10.1029/2004GL021646
Active thrust faulting offshore Boumerdes, Algeria, and its relations to the 2003 Mw 6.9 earthquake
UMR 6538, CNRS, Domaines Océaniques, Université de Bretagne Occidentale–Institut Universitaire Européen de la Mer, Plouzané, France
Centre de Recherche en Astronomie, Astrophysique et Géophysique, Bouzareah, Algeria
UMR 6538, CNRS, Domaines Océaniques, Université de Bretagne Occidentale–Institut Universitaire Européen de la Mer, Plouzané, France
UMR 6526, CNRS, Géosciences Azur, Valbonne, France
UMR 5025, CNRS, Laboratoire de Géologie des Chaînes Alpines, Université Joseph Fourier, Grenoble, France
Laboratoire d'Etudes des GéoEnvironnements Marins, Université de Perpignan, France
SONATRACH–Centre de Recherche et Développement, Boumerdes, Algeria
Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana, USA
Institut Français de Recherche pour l'Exploitation de la Mer, Plouzané, France
Centre de Recherche en Astronomie, Astrophysique et Géophysique, Bouzareah, Algeria
UMR 6538, CNRS, Domaines Océaniques, Université de Bretagne Occidentale–Institut Universitaire Européen de la Mer, Plouzané, France
Laboratoire d'Etudes des GéoEnvironnements Marins, Université de Perpignan, France
Institut Français de Recherche pour l'Exploitation de la Mer, Plouzané, France
We investigate the active seismogenic fault system in the area of the 2003 Mw 6.9 Boumerdes earthquake, Algeria, from a high-resolution swath bathymetry and seismic survey. A series of 5 main fault-propagation folds ∼20–35 km long leave prominent cumulative escarpments on the steep slope and in the deep basin. Fault activity creates Plio-Quaternary growth strata within uplifted areas such as a rollover basin on the slope and piggyback basins in the deep ocean. Most thrusts turn to fault-propagation folds at the sub-surface and depict ramp-flat trajectories. We find that the two main slip patches of the 2003 Mw 6.9 Boumerdes earthquake are spatially correlated to two segmented cumulative scarps recognized on the slope and at the foot of the margin. The overall geometry indicates the predominance of back thrusts implying underthrusting of the Neogene oceanic crust.
Received 30 September 2004; accepted 5 January 2005; published 23 February 2005.
Citation: (2005), Active thrust faulting offshore Boumerdes, Algeria, and its relations to the 2003 Mw 6.9 earthquake, Geophys. Res. Lett., 32, L04311, doi:10.1029/2004GL021646.
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