Recent sedimentary processes in the Prestige site area (Galicia Bank, NW Iberian Margin) evidenced by high-resolution marine geophysical methods
Special issue Geological characterization of the Galicia Bank Region (Atlantic Ocean, NW Iberia).-- 24 pages, 9 figures, 1 table
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| Format: | artículo biblioteca |
| Language: | English |
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| Subjects: | Galicia Bank, Echo-character analysis, High-resolution seismic profiles, Swath bathymetry, TOBI sidescan sonar, Sedimentary processes, TOBI, |
| Online Access: | http://hdl.handle.net/10261/26465 |
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dig-icm-es-10261-264652022-12-12T13:24:57Z Recent sedimentary processes in the Prestige site area (Galicia Bank, NW Iberian Margin) evidenced by high-resolution marine geophysical methods Hernández-Molina, Francisco J. Llave, Estefanía Ercilla, Gemma Maestro González, Adolfo Medialdea Cela, Teresa Ferrin, A. Somoza, Luis Gràcia, Eulàlia Masson, Douglas G. García, Marga Vizcaino, A. León Buendía, Ricardo F. Galicia Bank Echo-character analysis High-resolution seismic profiles Swath bathymetry TOBI sidescan sonar Sedimentary processes TOBI TOBI Special issue Geological characterization of the Galicia Bank Region (Atlantic Ocean, NW Iberia).-- 24 pages, 9 figures, 1 table An echo-character analysis of the oil tanker Prestige wreck area was undertaken using high-resolution marine geophysical methods (TOPAS and airgun seismic-reflection profiles, multibeam echosounder and TOBI sidescan sonar). Integration and comparison of the results using all these methods is presented given some practical applications for indirect near-surface and seafloor interpretations. Ten different echo types were identified and grouped into four main classes: I) distinct; II) indistinct; III) irregular and IV) hyperbolic. Echo-character distribution enabled us to determine recent sedimentary processes in the area. Two major depositional systems can be found through the identification of these sedimentary processes: a) a slope depositional system (SDS) located in the eastern and central area, where mass-movement processes are dominant and b) a turbiditic Main Channel depositional system (TDS) located in the western area where channel-related processes are dominant. Both of these interact over the half-graben structure of the southwestern sector of the Galicia Bank, where the Prestige wreck is located. Within the SDS, erosive and depositional mass-movement processes characterised a complex depositional system. Erosive processes occur on the fault scarp, channels head, inter-lobe channels and distal part of the sedimentary lobes. Moreover, depositional processes take place on the top of the fault scarp, sedimentary wedges, sedimentary lobes, and on the west flank of the Main Channel. Both depositional systems interact, but the SDS should be more active during fault-scarp reactivation periods, through relief rejuvenation and new exposed deposits. Microearthquake activity would favour the available materials, being weathered, eroded and transported by mass-movements. In such a situation, the TDS acts as the main collector of eroded sediment derived from the fault scarp throughout the SDS being responsible for its evacuation into the Iberian Abyssal Plain. However, outside of fault reactivation periods, the SDS is less active (such as during the present situation) The present study was funded by the Comisión de Coordinación Científica (MEC) Special Action and CICYT (MEC) ERGAP project (Ref. VEM 2003-20093-CO3) titled Identificación de riesgos geoambientales potenciales y su valoración en la zona de hundimiento del buque Prestige (Identification of Potential Geoenvironmental Risks in the Sinking Zone of the Prestige, and their Assessment). This work is also a contribution to the Consolider-Ingenio 2010 CSD2006-0041-“TopoIberia” Peer reviewed 2008-03-11 artículo http://purl.org/coar/resource_type/c_6501 Marine Geology 249(1-2): 21-45 (2008) 0025-3227 http://hdl.handle.net/10261/26465 10.1016/j.margeo.2007.09.011 en https://doi.org/10.1016/j.margeo.2007.09.011 none Elsevier |
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Galicia Bank Echo-character analysis High-resolution seismic profiles Swath bathymetry TOBI sidescan sonar Sedimentary processes TOBI TOBI Galicia Bank Echo-character analysis High-resolution seismic profiles Swath bathymetry TOBI sidescan sonar Sedimentary processes TOBI TOBI |
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Galicia Bank Echo-character analysis High-resolution seismic profiles Swath bathymetry TOBI sidescan sonar Sedimentary processes TOBI TOBI Galicia Bank Echo-character analysis High-resolution seismic profiles Swath bathymetry TOBI sidescan sonar Sedimentary processes TOBI TOBI Hernández-Molina, Francisco J. Llave, Estefanía Ercilla, Gemma Maestro González, Adolfo Medialdea Cela, Teresa Ferrin, A. Somoza, Luis Gràcia, Eulàlia Masson, Douglas G. García, Marga Vizcaino, A. León Buendía, Ricardo F. Recent sedimentary processes in the Prestige site area (Galicia Bank, NW Iberian Margin) evidenced by high-resolution marine geophysical methods |
| description |
Special issue Geological characterization of the Galicia Bank Region (Atlantic Ocean, NW Iberia).-- 24 pages, 9 figures, 1 table |
| format |
artículo |
| topic_facet |
Galicia Bank Echo-character analysis High-resolution seismic profiles Swath bathymetry TOBI sidescan sonar Sedimentary processes TOBI TOBI |
| author |
Hernández-Molina, Francisco J. Llave, Estefanía Ercilla, Gemma Maestro González, Adolfo Medialdea Cela, Teresa Ferrin, A. Somoza, Luis Gràcia, Eulàlia Masson, Douglas G. García, Marga Vizcaino, A. León Buendía, Ricardo F. |
| author_facet |
Hernández-Molina, Francisco J. Llave, Estefanía Ercilla, Gemma Maestro González, Adolfo Medialdea Cela, Teresa Ferrin, A. Somoza, Luis Gràcia, Eulàlia Masson, Douglas G. García, Marga Vizcaino, A. León Buendía, Ricardo F. |
| author_sort |
Hernández-Molina, Francisco J. |
| title |
Recent sedimentary processes in the Prestige site area (Galicia Bank, NW Iberian Margin) evidenced by high-resolution marine geophysical methods |
| title_short |
Recent sedimentary processes in the Prestige site area (Galicia Bank, NW Iberian Margin) evidenced by high-resolution marine geophysical methods |
| title_full |
Recent sedimentary processes in the Prestige site area (Galicia Bank, NW Iberian Margin) evidenced by high-resolution marine geophysical methods |
| title_fullStr |
Recent sedimentary processes in the Prestige site area (Galicia Bank, NW Iberian Margin) evidenced by high-resolution marine geophysical methods |
| title_full_unstemmed |
Recent sedimentary processes in the Prestige site area (Galicia Bank, NW Iberian Margin) evidenced by high-resolution marine geophysical methods |
| title_sort |
recent sedimentary processes in the prestige site area (galicia bank, nw iberian margin) evidenced by high-resolution marine geophysical methods |
| publisher |
Elsevier |
| url |
http://hdl.handle.net/10261/26465 |
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