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Eivissa slides, western Mediterranean Sea: morphology and processes

Eivissa slides, western Mediterranean Sea: morphology and processes
Eivissa slides, western Mediterranean Sea: morphology and processes
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.
0276-0460
225-233
Lastras, G.
bbcfeb6b-52ef-4a52-9c6c-26e40d67363f
Canals, M.
bebbc764-f420-47bd-8963-1f5ee6706251
Amblas, D.
55265d35-44bd-4c37-8e6a-74031bd92a4a
Ivanov, M.
3074e176-56b1-42f1-987a-2c8c33046535
Dennilou, B.
20696afe-e88b-41cc-922a-ea2577ddb638
Droz, L.
db2b89b4-cada-4dd0-a8c7-47006c58eff3
Akhmetzhanov, A.
c46da8d8-8b9f-404b-9b57-9f669d37d781
Lastras, G.
bbcfeb6b-52ef-4a52-9c6c-26e40d67363f
Canals, M.
bebbc764-f420-47bd-8963-1f5ee6706251
Amblas, D.
55265d35-44bd-4c37-8e6a-74031bd92a4a
Ivanov, M.
3074e176-56b1-42f1-987a-2c8c33046535
Dennilou, B.
20696afe-e88b-41cc-922a-ea2577ddb638
Droz, L.
db2b89b4-cada-4dd0-a8c7-47006c58eff3
Akhmetzhanov, A.
c46da8d8-8b9f-404b-9b57-9f669d37d781

Lastras, G., Canals, M., Amblas, D., Ivanov, M., Dennilou, B., Droz, L. and Akhmetzhanov, A. (2006) Eivissa slides, western Mediterranean Sea: morphology and processes. Geo-Marine Letters, 26 (4), 225-233. (doi:10.1007/s00367-006-0032-4).

Record type: Article

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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Published date: 2006

Identifiers

Local EPrints ID: 42986
URI: http://eprints.soton.ac.uk/id/eprint/42986
ISSN: 0276-0460
PURE UUID: dc076c63-7bce-4062-9861-9ec57e5f4e52

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Date deposited: 04 Jan 2007
Last modified: 15 Mar 2024 08:52

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Contributors

Author: G. Lastras
Author: M. Canals
Author: D. Amblas
Author: M. Ivanov
Author: B. Dennilou
Author: L. Droz
Author: A. Akhmetzhanov

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