Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/35411
Title: Multi-event oceanic island landslides: New onshore-offshore insights from El Hierro Island, Canary Archipelago
Authors: León, Ricardo
Somoza, Luis
Urgeles, Roger
Medialdea, Teresa
Ferrer, Mercedes 
Biain, Ander
García-Crespo, Jesús
Mediato, José Francisco
Galindo, Inés
Yepes, Jorge 
González, Francisco Javier
Gimenez-Moreno, Julia
UNESCO Clasification: 2506 Geología
2416 Paleontología
250601 Geología regional
Keywords: Submarine landslides
Volcanic islands
Debris avalanche
Canary Islands
Issue Date: 2017
Journal: Marine Geology 
Abstract: This paper presents a combined onshore-offshore morpho-structural characterization of the El Golfo giant landslide, island of El Hierro (Canary Archipelago, Spain). Offshore data from multibeam echosounders, chirp sub bottom profiles and multichannel seismic reflection data and onshore data coming from water wells and galleries have been analyzed. The geomorphology and the internal architecture of this giant flank collapse are defined in order to determine its multi-event nature. The subaerial headscarp shows a non-continuous arcuate profile formed by two nested semi-circular amphitheaters that extend offshore along a smooth chute, suggesting the occurrence of at least two large retrogressive events. 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 transport deposits (MTDs), debris avalanche, are identified on multichannel seismic reflection profiles with a total estimated volume of 318 km(3): similar to 84 km(3) and similar to 234 km(3), for the younger and older MTDs respectively. Data from wells and galleries show abrasion platforms with beach deposits at sea-level (0 masl) formed after the landslide scar and buried by the post-collapse El Golfo lavas infill, suggesting an age at least older than 23.5-82.5 Ma for the landslide.
URI: http://hdl.handle.net/10553/35411
ISSN: 0025-3227
DOI: 10.1016/j.margeo.2016.07.001
Source: Marine Geology[ISSN 0025-3227],v. 393, p. 156-175
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