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Onshore-offshore insights of multi-event oceanic island landslides: (El Hierro Island, Canary Archipelago)

AuthorsLeón, Ricardo; Biain, Ander; Urgeles, Roger ; Somoza, Luis; Ferrer, Mercedes; Garcia-Crespo, J.; Mediato, J. F.; Medialdea, Teresa; Galindo, I.; Yepes, J.; Giménez-Moreno, Julia
Issue Date8-Apr-2018
PublisherEuropean Geosciences Union
CitationGeophysical Research Abstracts 20: EGU2018-3000 (2018)
AbstractBased on the re-interpretation of a vast onshore-offshore data base in the El Hierro island (Canary Archipelago,Spain), a new onshore-offshore morpho-structural characterization of the El Golfo giant landslide is presented.Offshore data from multibeam echosounders, chirp sub-bottom profiles and multichannel seismic reflection dataand onshore data coming from water wells and galleries have been analyzed in order to determine its multi-eventnature. The subaerial headscarp shows a non-continuous arcuate profile formed by two nested semi-circular am-phitheaters that extend offshore along a smooth chute, suggesting the occurrence of at least two large retrogressiveevents. Channels/gullies and escarpments developed along the submarine sector of the scar also indicate smaller-scale events and predominance of sediment bypass. In the lower slope, two subunits of submarine mass transportdeposits (MTDs), debris avalanche, are identified on multichannel seismic reflection profiles with a total estimatedvolume of 318 km3:∼84 km3 and∼234 km3, for the younger and older MTDs respectively. Data from wellsand galleries show abrasion platforms with beach deposits at sea-level (0 masl) formed after the landslide scar andburied by the post-collapse El Golfo lavas infill, suggesting an age at least older than 23.5-82.5 Ka for the landslide
DescriptionEuropean Geosciences Union (EGU) General Assembly 2018, 8-13 April 2018, Vienna, Austria.-- 1 page
Publisher version (URL)https://meetingorganizer.copernicus.org/EGU2018/posters/27447
Identifiersissn: 1607-7962
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