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Multi-event behavior of El Golfo landslide (El Hierro Island, Canary Archipelago)

AuthorsLeón, Ricardo; Biain, Ander; Somoza, Luis; Urgeles, Roger ; Somoza, Luis; Ferrer, Mercedes; Garcia-Crespo, J.; Mediato, J. F.; Galindo, I.; Yepes, J.; Giménez-Moreno, Julia
KeywordsSubmarine landslides
Debris avalanche
Canary Islands
Volcanic islands
Issue Date23-Apr-2017
PublisherEuropean Geosciences Union
CitationGeophysical Research Abstracts 19: EGU2017-12804-1 (2017)
AbstractBased on the re-interpretation of a vast onshore-offshore data set, a new morpho-structural characterization of theEl Golfo giant landslide in the island of El Hierro (Canary Archipelago, Spain) is presented. Offshore multibeamechosounder data, chirp sub-bottom profiles, multichannel seismic reflection data and onshore information fromwater wells and galleries have been analyzed to determine the nature of the event. The subaerial headscarpshows a non-continuous arcuate profile formed by two nested semi-circular amphitheaters that extend offshorealong a smooth chute, suggesting the occurrence of at least two large retrogressive events. Channels/gullies andescarpments developed along the submarine sector of the scar also indicate smaller-scale events and predominanceof sediment bypass. At the base of submerged island, two subunits within the related submarine mass transportdeposit (MTD) are identified on multichannel seismic reflection profiles confirming the multi-event nature of thelandslide. The MTD, identified as a debris avalanche, has a total estimated volume of 318 km3:∼84 km3 and∼234 km3, for the lower and upper subunits respectively. Data from wells and galleries show abrasion platformswith beach deposits at sea-level (0 masl) formed after the landslide scar and buried by the El Golfo post-collapseinfill lavas, suggesting an age at least older than 23.5-82.5 ka for the landslide
DescriptionEuropean Geosciences Union General Assembly 2017, 23-28 April 2017, Vienna, Austria.-- 1 page
Publisher version (URL)https://meetingorganizer.copernicus.org/EGU2017/posters/23048
Identifiersissn: 1607-7962
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