Landslides in the Upper Submarine Slopes of Volcanic Islands: The Central Azores

Chang, Yu-Chun; Mitchell, Neil C.; Quartau, Rui

doi:10.1029/2021gc009833

Cited by 11 publications

(5 citation statements)

References 123 publications

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“…On the other hand, the tendency of volcanic islands to experience slope failures along their flanks (e.g. Le Bas et al, 2007;Chang et al, 2021) and shelf margins (e.g. Quartau et al, 2015) can supply sediment to a canyon by both individual large-scale failures (e.g.…”

Section: Interpretationsmentioning

confidence: 99%

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A global analysis of controls on submarine-canyon geomorphology

Bührig¹,

Colombera²,

Patacci³

et al. 2023

Preprint

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The role of possible controlling factors in influencing the geomorphology of submarine canyons has been investigated using a database of 282 globally distributed modern examples collated from the literature, open-source worldwide bathymetry and satellite imagery. Canyon geomorphology has been characterized quantitatively in terms of maximum and average canyon dimensions, canyon sinuosity, the average canyon thalweg gradient, and maximum canyon sidewall steepness. Geomorphological variations with respect to position of the canyon apex relative to the shelf break, continental-margin type, terrestrial source-to-sink system setting, oceanographic environment, and climate zones have been assessed. Scaling relationships between canyon morphometric parameters, and between them and attributes of their physiographic setting, their terrestrial catchments, and attributes of continental shelves and slopes have been quantified.Key findings are as follows: (i) a number of scaling relationships describing canyon morphometry (e.g. scaling between maximum canyon dimensions, relationships of maximum canyon sidewall steepness with maximum canyon width and depth) can be recognized globally, suggesting their general predictive value; (ii) possible causal links are identified between hydrodynamic processes (e.g. upwelling, longshore- and along-slope currents) and canyon morphology; (iii) potential predictors of canyon geomorphology include whether a canyon is incised into the shelf or confined to the slope, the continental-margin type, the oceanographic environment, latitude, and shelf-break depth; (iv) similarity in maximum width-to-maximum depth ratios across all settings suggests that the relative magnitudes of canyon-margin erosion and intra-canyon deposition do not vary greatly depending on setting or canyon size.The relationships between canyon geomorphology and environmental variables identified in this study may be incorporated into conceptual models describing canyon geomorphology and its relationship to other elements of deep-water systems, and into its broader source-to-sink context.

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Section: Interpretationsmentioning

confidence: 99%

“…Le Bas et al, 2007) and high-frequency smaller failures (e.g. Chang et al, 2021). The importance of volcanic activity as a trigger for submarine slope failures, however, might be subordinate where other factors prevail, as storm events and onshore failure (Clare et al, 2018).…”

Section: Interpretationsmentioning

confidence: 99%

A global analysis of controls on submarine-canyon geomorphology

Bührig¹,

Colombera²,

Patacci³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Oiwane et al, 2011), thereby reducing the potential of mass failure on slopes (e.g. Chang et al, 2021) and within canyons. With increasing distance between the river mouth and the submarine canyon head, the sediment transport efficiency decreases as a function of distance and grain size.…”

Section: Interpretationsmentioning

confidence: 99%