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The Baraza Slide: model and dynamics |
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| Authors: | D Casas G Ercilla M Yenes F Estrada B Alonso M Garc??a L Somoza |
| Institution: | 1. Instituto Geol??gico y Minero de Espa?a, C/R??os Rosas, n?? 23, 28003, Madrid, Spain 2. Institut de Ci??ncies del Mar, CSIC, Passeig Mar??tim Barceloneta, n?? 37?C49, 08003, Barcelona, Spain 3. Escuela Polit??cnica Superior de Zamora, Universidad de Salamanca, 37008, Salamanca, Spain 4. Scott Polar Research Institute, University of Cambridge, Lensfield Road, CB2 1ER, Cambridge, UK |
| Abstract: | The Baraza Slide is located in the northwestern Alboran Sea, western Mediterranean region, between 590 and 830?m water depth, and its morphology, seismic facies and sedimentary structure are analyzed based on multibeam bathymetry and very high to medium resolution single-channel seismic records. During the Pleistocene and Late Quaternary this landslide has undergone repeated slope failures characterized by a succession of two main types of mass movement, the first of the mass-flow type and the second of the slide type. This study also reveals that the western sector of this landslide could still be active. The relatively high slope gradients, a sedimentary column characterized by the presence of under consolidated layers and earthquake shaking related to tectonic activity on the margin are the factors governing the genesis and post-mobility behavior of the Baraza mass movement. The recognition and analysis of these factors suggest that the Baraza Slide should be considered as a geo-hazard in the tectonically active Alboran Sea. |
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