Identificación de riesgos geoambientales y su valoración en la zona de hundimiento del buque Prestige



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Ercilla, Gemma and Alonso Martínez, Belén and Casas Layola, David and Estrada Llacer, Ferran and Farran, M. and García, M. and Gallart Muset, Josep and Díaz Cusí, Jordi and Ruiz, M. and Somoza Losada, Luis and Maestro, Adolfo and Medialdea Cela, Teresa and León Buendía, Ricardo and Llave, E. and Gràcia Mont, Eulalia and Dañobeitia, J.J. and García, M.A. and Vizcaíno, M.A. and Díez Tagarro, Susana and Muñoz, J.A. and Roca, E. and Fernández, O. and Carreras Sangrà, Nelson and Benjumea, B. and Mencos, J. and Vázquez, Juan Tomás and Sayazo, M. and Pérez, C. and Córdoba, D. and Octavio de Toledo Rodríguez, María del Mar and Agudo, Luis Miguel and Vilas Martín, Federico and García, S. and Hernández Molina, F.J. and Rey, D. and Rubio, B. and Álvarez, R. and Durán, R. and Fernández, C.A. and Ferrin, A. and Jacob Mohamed, K. (2004) Identificación de riesgos geoambientales y su valoración en la zona de hundimiento del buque Prestige. Geotemas, 6 (5). pp. 252-254. ISSN 1576-5172

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Potential geological hazard assessment has been carried out in the area where the Prestige vessel was sunk using a broad database that comprises: multibeam, high and ultra-high resolution seismic profiles, gravity cores, onland seismicity stations and Ocean Bottom Seismometers (OBS). The main results of this study indicate that among the geologic factors that can be considered as potential hazards, four main categories can be differentiated based on their origin: morphologic, sedimentary, tectonic, and seismicity. Hazards of morphologic origin include steep gradients; the morphologic features suggest the occurrence of mass-wasting instabilities. Hazards of sedimentary origin also includes the occurrence of slope instability processes in form of single slides and a great variety of erosive and depositional gravity flows (debris and turbidity flows). Hazards of tectonic and seismic origin are important because the sinking area straddles the Calida Bank which is a structural seamount with a moderate tectonic activity that results in a latent seismicity of low to moderate magnitude. The interaction of these factors leads to consider to the risk as medium, and the degree of exposure of the bow and stern as high. Several general and specific recommendations are made in order to increase the geological and geophysics knowledgement in the Prestige sinking area and Spanish continental margins and deep sea areas. These recommendations also should be used to elaborate the options for reducing the hazard and loss.

Item Type:Article
Uncontrolled Keywords:Hazard, Morphology, Sedimentology, Tectonics, Seismicity
Subjects:Sciences > Geology > Geodynamics
Sciences > Geology > Seismology
ID Code:61038
Deposited On:22 Jun 2020 11:16
Last Modified:22 Jun 2020 11:16

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