Eivissa slides, western Mediterranean Sea: morphology and processes

Type Article
Date 2006-10
Language English
Author(s) Lastras Galderic1, Canals M1, Amblas D1, Ivanov M2, Dennielou BernardORCID3, Droz Laurence4, Akhmetzhanov A5
Affiliation(s) 1 : Univ Barcelona, GRC Geociencies Marines, E-08028 Barcelona, Spain.
2 : Moscow MV Lomonosov State Univ, UNESCO, Ctr Marine Geol & Geophys, Moscow 199899, Russia.
3 : IFREMER, DROGM, F-29280 Plouzane, France.
4 : Univ Bretagne Occidentale, CNRS, F-29280 Plouzane, France.
5 : Natl Oceanog Ctr, Southampton SO14 3ZH, Hants, England.
Source Geo-Marine Letters (0276-0460) (Springer), 2006-10 , Vol. 26 , N. 4 , P. 225-233
DOI 10.1007/s00367-006-0032-4
WOS© Times Cited 25
Keyword(s) Morphology, Bathymetry, Slides, Mediterranean sea, Eivissa channel
Abstract After obtaining full-coverage swath bathymetry data in 1995 and very high-resolution acoustic profiles in 2002, four slides at the Balearic Margin of the Eivissa Channel in the western Mediterranean Sea were revisited in 2004 when side-scan sonar data were collected using a MAK-1M deep-towed acoustic system. These new findings, higher in resolution than those for the swath bathymetry, show two main features previously undetected within these submarine landslides: (1) a series of step-forming inclined and detached slabs oriented perpendicular to the slide movement and located in the uppermost part of the slides, and (2) arcuate regular positive ridges oriented also normal to the slide movement and located in the depositional lobes of some of the slides. The former are interpreted as extensional ridges, suggesting a retrogressive post-failure evolution of the slides. The latter are interpreted as compression ridges, related to plastic deformation of the sediment before movement freezing. Moreover, the new data show that fluid escape features are even more widespread in the Eivissa Channel than previously thought, dozens of new pockmarks less than 20 m in diameter having been identified.
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