Distal turbidites reveal a common distribution for large (>0.1 km3) submarine landslide recurrence

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1130/G35160.1.

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Authors

Michael Clare, Peter Talling, James Hunt, Peter Challenor, Giusseppe Malgesini

Abstract

Submarine landslides can be far larger than those on land, and are one of the most important processes for moving sediment across our planet. Landslides that are fast enough to disintegrate can generate potentially very hazardous tsunamis, and produce long run-out turbidity currents that break strategically important cable networks. It is important to understand their frequency and triggers. We document the distribution of recurrence intervals for large landslide-triggered turbidity currents (>0.1 km3) in three basin-plains. A common distribution of recurrence intervals is observed, despite variable ages and disparate locations, suggesting similar underlying controls on slide triggers and frequency. This common distribution closely approximates a temporally-random Poisson distribution, such that the probability of a large disintegrating slide occurring along the basin margin is independent of the time since the last slide. This distribution suggests that non-random processes such as sea level are not a dominant control on frequency of these slides. Recurrence intervals of major (>M 7.3) earthquakes have an approximately Poissonian distribution, suggesting they could be implicated as triggers. However, not all major earthquakes appear to generate widespread turbidites, and other as yet unknown triggers or sequential combinations of processes could produce the same distribution. This is the first study to show that large slide-triggered turbidites have a common frequency distribution in distal basin plains, and that this distribution is temporally random. This result has important implications for assessing hazards from landslide-tsunamis and seafloor cable breaks, and the long-term tempo of global sediment fluxes.

DOI

https://doi.org/10.31223/osf.io/ge27p

Subjects

Earth Sciences, Geology, Physical Sciences and Mathematics, Probability, Sedimentology, Statistics and Probability

Keywords

geohazard, submarine landslide, Landslide, turbidity current, Geohazards

Dates

Published: 2017-10-26 04:18

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License

Academic Free License (AFL) 3.0

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