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Near-synchronous and delayed initiation of long run-out submarine sediment flows from a record breaking river-flood, offshore Taiwan

Carter, L., Milliman, J.D., Talling, P.J., Gavey, R. and Wynn, R.B. (2012) Near-synchronous and delayed initiation of long run-out submarine sediment flows from a record breaking river-flood, offshore Taiwan Geophysical Research Letters, 39, L12603. (doi:10.1029/2012GL051172).

Record type: Article

Abstract

Subsea fiber-optic telecommunication cables can break under fast sediment flows that travel 100s of kilometers through the deep ocean in response to earthquakes and submarine landslides. Similar flows are inferred to form from major river floods whose sediment-laden waters plunge and travel along the seabed. However, the complex initiation of flood-related flows and their hazard potential have not been observed until now. Here we use cable fault data from the Gaoping Canyon/Manila Trench off Taiwan to show that a major river flood, formed during Typhoon Morakot (2009), generated two, long run-out, destructive sediment flows; one during peak flood and the other 3 days later. The latter flow was more damaging with speeds and run-out similar to that of landslide-triggered turbidity currents formed in the same catchment. If the second flow was due to remobilized canyon sediment, it occurred during low earthquake (>Mw 2.0) activity, suggesting other triggering mechanisms.

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Published date: 2012
Organisations: Marine Geoscience

Identifiers

Local EPrints ID: 342297
URI: http://eprints.soton.ac.uk/id/eprint/342297
ISSN: 0094-8276
PURE UUID: 916d2753-7b75-4e08-899d-70112e973664

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Date deposited: 20 Aug 2012 15:56
Last modified: 18 Jul 2017 05:30

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Contributors

Author: L. Carter
Author: J.D. Milliman
Author: P.J. Talling
Author: R. Gavey
Author: R.B. Wynn

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