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1 Institut Universitaire Europeen de la Mer, UMR 6538, Domaines Oceaniques, Plouzane, Brittany F-29280, France
2 Bullard Laboratories, Cambridge University, Madingley Road, Cambridge CB3 0EZ, UK
3 Institute of Earth Sciences, University of Lisbon, Rua de Escola Politecnica 58, Lisbon 1269-102, Portugal
4 Faculty of Earth Sciences, Utrecht University, Budapestlaan 4, Utrecht NL-3508, Netherlands
We report on a marine seismic survey that images an active accretionary wedge west of Gibraltar. Ramp thrusts offset the seafloor and sole out to an east-dipping décollement, indicating ongoing westward-vergent tectonic shortening. New traveltime tomographic results image a slab of oceanic lithosphere descending from the Atlantic domain of the Gulf of Cadiz, passing through intermediate-depth (60–120 km) seismicity beneath the westernmost Alboran Sea, and merging with a region of deep-focus earthquakes 600–660 km below Granada, Spain. Together, these new data provide compelling evidence for an active east-dipping subduction zone.
Key Words: subduction • Africa • Iberia • accretionary wedge
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