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Seafloor imagery from the BIG'95 debris flow, western Mediterranean

Seafloor imagery from the BIG'95 debris flow, western Mediterranean
Seafloor imagery from the BIG'95 debris flow, western Mediterranean
Seafloor backscatter data are used to image the product of one of the youngest major mass-wasting events in the northwestern Mediterranean Sea: a 26 km3 debris-flow deposit that covers 2000 km2 of the Ebro continental slope and base of slope, offshore Spain. Backscatter images provide unprecedented insights on debris-flow dynamics in the deep sea. A pattern of low-backscatter patches represents large sediment blocks that moved while keeping their internal coherence. High-backscatter alignments restricted to topographic lows that represent coarse sediment pathways separate the blocks. The results presented prove the occurrence of large catastrophic sediment failures near heavily populated coastal areas even in continental margins considered to be geodynamically quiet, such as those of the northwestern Mediterranean.
medwnw, debris flow, backscatter, sediment dynamics, "hesperides", "l'atalante", geology, continental slope, seafloor imagery, western mediterranean
0091-7613
871-874
Lastras, G.
bbcfeb6b-52ef-4a52-9c6c-26e40d67363f
Canals, M.
bebbc764-f420-47bd-8963-1f5ee6706251
Hughes-Clarke, J.E.
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Moreno, A.
724eb4f2-058c-42f4-b074-9c564e8271b7
De Batist, M.
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Masson, D.G.
edd44c8b-38ca-45fb-8d0d-ac8365748a45
Cochonat, P.
605daa4e-5b58-4084-97f0-292ba93ef274
Lastras, G.
bbcfeb6b-52ef-4a52-9c6c-26e40d67363f
Canals, M.
bebbc764-f420-47bd-8963-1f5ee6706251
Hughes-Clarke, J.E.
080b4741-6ebe-4702-9cb0-34bfba4f7b9f
Moreno, A.
724eb4f2-058c-42f4-b074-9c564e8271b7
De Batist, M.
7877df8a-25d7-4559-8077-a3f7cde2d0a8
Masson, D.G.
edd44c8b-38ca-45fb-8d0d-ac8365748a45
Cochonat, P.
605daa4e-5b58-4084-97f0-292ba93ef274

Lastras, G., Canals, M., Hughes-Clarke, J.E., Moreno, A., De Batist, M., Masson, D.G. and Cochonat, P. (2002) Seafloor imagery from the BIG'95 debris flow, western Mediterranean. Geology, 30 (10), 871-874. (doi:10.1130/0091-7613(2002)030<0871:SIFTBD>2.0.CO;2).

Record type: Article

Abstract

Seafloor backscatter data are used to image the product of one of the youngest major mass-wasting events in the northwestern Mediterranean Sea: a 26 km3 debris-flow deposit that covers 2000 km2 of the Ebro continental slope and base of slope, offshore Spain. Backscatter images provide unprecedented insights on debris-flow dynamics in the deep sea. A pattern of low-backscatter patches represents large sediment blocks that moved while keeping their internal coherence. High-backscatter alignments restricted to topographic lows that represent coarse sediment pathways separate the blocks. The results presented prove the occurrence of large catastrophic sediment failures near heavily populated coastal areas even in continental margins considered to be geodynamically quiet, such as those of the northwestern Mediterranean.

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More information

Published date: 2002
Keywords: medwnw, debris flow, backscatter, sediment dynamics, "hesperides", "l'atalante", geology, continental slope, seafloor imagery, western mediterranean

Identifiers

Local EPrints ID: 6124
URI: http://eprints.soton.ac.uk/id/eprint/6124
ISSN: 0091-7613
PURE UUID: 0ef122a6-b703-4791-b1e6-0254e774ce8e

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Date deposited: 29 Jun 2004
Last modified: 08 Jan 2022 15:44

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Contributors

Author: G. Lastras
Author: M. Canals
Author: J.E. Hughes-Clarke
Author: A. Moreno
Author: M. De Batist
Author: D.G. Masson
Author: P. Cochonat

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