Journal
MARINE GEOLOGY
Volume 393, Issue -, Pages 156-175Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.margeo.2016.07.001
Keywords
Submarine landslides; volcanic islands; debris avalanche; Canary Islands
Categories
Funding
- Spanish research project SUBVENT [CGL2012-39524-0O2-02]
- Project for the Extension of the Continental Shelf West to Canary Islands [CTM2010-09496-E]
- S4SLIDE project (Significance of Modern and Ancient Submarine Slope LandSLIDEs) [IGCP-640]
Ask authors/readers for more resources
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. (C) 2016 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available