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Multistage collapse of eight western Canary Island landslides in the last 1.5 Ma: Sedimentological and geochemical evidence from subunits in submarine flow deposits

Multistage collapse of eight western Canary Island landslides in the last 1.5 Ma: Sedimentological and geochemical evidence from subunits in submarine flow deposits
Multistage collapse of eight western Canary Island landslides in the last 1.5 Ma: Sedimentological and geochemical evidence from subunits in submarine flow deposits
Volcaniclastic turbidites in the Madeira Abyssal Plain provide a record of major landslides from the Western Canary Islands in the last 1.5 Ma. These volcaniclastic turbidites are composed of multiple fining-upward turbidite sands, known as subunits. The subunits indicate that the landslides responsible for the sediment gravity flows occurred in multiple stages. The subunits cannot result from flow reflection or splitting because the compositions of volcanic glasses from each individual subunit in an event bed are subtly different. This indicates that each subunit represents a discrete failure as part of a multistage landslide. This has significant implications for geohazard assessments, as multistage failures reduce the magnitude of the associated tsunami. The multistage failure mechanism reduces individual landslide volumes from up to 350 km3 to less than 100 km3. Thus although multistage failure ultimately reduce the potential landslide and tsunami threat, the landslide events may still generate significant tsunamis close to source.
1525-2027
2159-2181
Hunt, J.E.
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Wynn, R.B.
72ccd765-9240-45f8-9951-4552b497475a
Talling, P.J.
1cbac5ec-a9f8-4868-94fe-6203f30b47cf
Masson, D.G.
edd44c8b-38ca-45fb-8d0d-ac8365748a45
Hunt, J.E.
43fd3144-04cd-43d9-b341-b70f2a03bf91
Wynn, R.B.
72ccd765-9240-45f8-9951-4552b497475a
Talling, P.J.
1cbac5ec-a9f8-4868-94fe-6203f30b47cf
Masson, D.G.
edd44c8b-38ca-45fb-8d0d-ac8365748a45

Hunt, J.E., Wynn, R.B., Talling, P.J. and Masson, D.G. (2013) Multistage collapse of eight western Canary Island landslides in the last 1.5 Ma: Sedimentological and geochemical evidence from subunits in submarine flow deposits. Geochemistry, Geophysics, Geosystems, 14 (7), 2159-2181. (doi:10.1002/ggge.20138).

Record type: Article

Abstract

Volcaniclastic turbidites in the Madeira Abyssal Plain provide a record of major landslides from the Western Canary Islands in the last 1.5 Ma. These volcaniclastic turbidites are composed of multiple fining-upward turbidite sands, known as subunits. The subunits indicate that the landslides responsible for the sediment gravity flows occurred in multiple stages. The subunits cannot result from flow reflection or splitting because the compositions of volcanic glasses from each individual subunit in an event bed are subtly different. This indicates that each subunit represents a discrete failure as part of a multistage landslide. This has significant implications for geohazard assessments, as multistage failures reduce the magnitude of the associated tsunami. The multistage failure mechanism reduces individual landslide volumes from up to 350 km3 to less than 100 km3. Thus although multistage failure ultimately reduce the potential landslide and tsunami threat, the landslide events may still generate significant tsunamis close to source.

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Published date: July 2013
Organisations: Ocean and Earth Science, Marine Geoscience

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Local EPrints ID: 363020
URI: http://eprints.soton.ac.uk/id/eprint/363020
ISSN: 1525-2027
PURE UUID: aca0ba89-782a-4dcb-afa8-9377eb1c460a

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Date deposited: 11 Mar 2014 10:39
Last modified: 08 Jan 2022 18:08

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Contributors

Author: J.E. Hunt
Author: R.B. Wynn
Author: P.J. Talling
Author: D.G. Masson

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