Publication: Cartografía del ecocarácter del Margen Continental de Galicia y de las llanuras abisales adyacentes
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Publication Date
2021
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Sociedad Geológica de España.
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Abstract
La cartografía y análisis de las facies acústicas que se determinan a partir de la interpretación y correlación de los perfiles sísmicos de muy alta resolución, es una herramienta muy útil para la caracterización de los procesos sedimentarios recientes y su distribución en ambientes marinos profundos. Este trabajo presenta el primer mapa de ecocarácter del Margen Continental de Galicia y las llanuras abisales adyacentes. El mapa se realizó sobre la base del análisis e interpretación de los datos de batimetría y reflectividad de las ecosondas multihaz SIMRAD EM12, EM120 y EM1002, y los perfiles sísmicos de muy alta resolución de la ecosonda paramétrica SIMRAD TOPAS PS18. Sobre la base de la morfología del fondo marino, la reflectividad y los caracteres del eco acústico, se identificaron 26 tipos de ecos en la secuencia sedimentaria más superficial.
Estos tipos de eco se han clasificado en cuatro grupos principales: bien definidos, irregulares, hiperbólicos y ondulados. Esta información ha sido adquirida en el marco del ‘Programa de Investigación Científica de la Zona Económica Exclusiva Española’, coordinado por el Ministerio de Defensa, durante las campañas oceanográficas que se han realizado a bordo del BIO Hespérides del 2001 a 2003 y del 2006 a 2009.
The acoustic facies mapping and analyses from the interpretation and correlation of very high resolution seis- mic profiles, is a very useful tool for the characterization of the recent sedimentary processes and their distribution in the deep-sea environments. This work presents the first echo-character map of the Galicia Continental Margin and the adjacent abyssal plains. The map was carried out on the basis of the analysis and interpretation of the bathymetry and reflectivity data from the SIMRAD EM12, EM120 and EM1002 multibeam echosounders, and the high resolution seismic profiles from the SIMRAD TOPAS PS18 parametric echosounder. Based on the seafloor morphology, backscatter and acoustic echo-characters, 26 echo types were identified in the uppermost sedimentary sequence. These echo-types have been classified into four main groups: Distinct, Irregular, Hyperbolic and Undulated echoes. This information has been acquired in the framework of the ‘Scientific Research Program of the Economic Exclusive Zone of Spain’, which is coordinated by the Defense Ministry, during the oceanographic cruises carried out on board of the R/V Hesperides in 2001 to 2003 and 2006 to 2009.
The acoustic facies mapping and analyses from the interpretation and correlation of very high resolution seis- mic profiles, is a very useful tool for the characterization of the recent sedimentary processes and their distribution in the deep-sea environments. This work presents the first echo-character map of the Galicia Continental Margin and the adjacent abyssal plains. The map was carried out on the basis of the analysis and interpretation of the bathymetry and reflectivity data from the SIMRAD EM12, EM120 and EM1002 multibeam echosounders, and the high resolution seismic profiles from the SIMRAD TOPAS PS18 parametric echosounder. Based on the seafloor morphology, backscatter and acoustic echo-characters, 26 echo types were identified in the uppermost sedimentary sequence. These echo-types have been classified into four main groups: Distinct, Irregular, Hyperbolic and Undulated echoes. This information has been acquired in the framework of the ‘Scientific Research Program of the Economic Exclusive Zone of Spain’, which is coordinated by the Defense Ministry, during the oceanographic cruises carried out on board of the R/V Hesperides in 2001 to 2003 and 2006 to 2009.