Extreme erosion by submarine slides

Nugraha, Harya D.; Jackson, Christopher A.-L.; Johnson, Howard D.; Hodgson, David M.; Clare, Michael A. ORCID: https://orcid.org/0000-0003-1448-3878. 2022 Extreme erosion by submarine slides. Geology. https://doi.org/10.1130/G50164.1

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Abstract/Summary

Submarine slides (including slides, slumps, and debris flows) pose major geohazards by triggering tsunami and damaging essential submarine infrastructure. Slide volume, a key parameter in hazard assessments, can increase markedly through substrate and/or water entrainment. However, the erosive potential of slides is uncertain. We quantified slide erosivity by determining the ratio of deposited (Vd) to initially evacuated (Ve) sediment volumes; i.e., slides that gain volume through erosion have a Vd/Ve ratio >1. We applied this method to the Gorgon slide, a large (500 km3 ), seismically imaged slide offshore northwestern Australia, and reviewed Vd/Ve ratios for 11 other large slides worldwide. Nine of the 11 slides have Vd/Ve > 1 (median value = 2), showing emplaced volumes increased after initial failure. The Gorgon slide is the most erosive slide currently documented (Vd/Ve = 13), possibly reflecting its passage across a highly erodible carbonate ooze substrate. Our new approach to quantifying erosion is important for hazard assessments given substrate-flow interactions control slide speed and runout distance. The variations in slide volume also have important implications for submarine infrastructure impact assessments, including more robust tsunami modeling.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1130/G50164.1
ISSN:	0091-7613
Date made live:	20 Jul 2022 11:35 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/532956

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