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Title

Onshore and offshore geomorphological features of the El Golfo debris avalanche (El Hierro, Canary Islands)

AuthorsBiain, Ander; León, Ricardo; Urgeles, Roger ; Somoza, Luis; Medialdea, Teresa; Ferrer, Mercedes; González Sanz, Francisco Javier
KeywordsOceanic volcano
Flank collapse
Debris avalanche
Morpho-structural characterization
Canary Islands
Tsunami
Issue Date1-Nov-2015
Citation7th International Symposium on Submarine Mass Movements and Their Consequences. Conference Abstracts: 6 (2015)
AbstractThis study shows an onshore-offshore morpho-structural characterization of the El Golfo flank collapse and debris avalanche on El Hierro (Canary Islands, Spain). Erosive and depositional features have been identified based on: LIDAR topography and geology from water galleries (onshore); and high-resolution 3.5 kHz and multichannel seismic reflection profiles, and multibeam data (offshore). The onshore headwall scarp shows a non-continuous profile formed by two semi-circular amphitheatres and extends offshore by a smooth chute. The chute ends at about 3000-3200 m water depth in the distal depositional area. Multichannel seismic profiles show two major subunits of chaotic reflectors in the debris avalanche deposits. Results suggest that the El Golfo debris avalanche event likely took place in multiple stages. Consequently, we suggest that the multistaged nature of El Golfo debris avalanche greatly reduces the tsunamigenic potential of these flank collapses
Description7th International Symposium on Submarine Mass Movements and Their Consequences, 1-4 November 2015, Wellington, New Zealand
URIhttp://hdl.handle.net/10261/141402
Appears in Collections:(ICM) Comunicaciones congresos
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