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1 Instituto Andaluz de Geofísica, Universidad de Granada, 18071-Granada, Spain
2 Departamento de Geodinámica, Universidad de Granada, 18071-Granada, Spain
3 Department of Earth Sciences, Ehime University, Matsuyama 790-8577, Japan
4 Instituto Geográfico Nacional, General Ibáñez de Ibero, 28003-Madrid, Spain
P- and S-wave seismic tomography detect a low-velocity anomaly in the upper mantle beneath the Betic Cordillera and the Alborán Sea region. The anomaly is associated with the intermediate-depth seismicity (h < 110 km) in the region. This structure is interpreted as a result of an active continental subduction. Gravity modeling and seismic attenuation also show the continental nature of the low-velocity zone. Stresses determined from the focal mechanisms of the intermediate-depth earthquakes also agree with the scenario of continental subduction, which is caused by the middle-late Miocene to present-day northwest-southeast convergence of the African and European plates and the continental collision that raised the cordillera.
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