Styles of slope instability on a Quaternary sub-arctic continental margin: The northwest flank of the Storegga Slide

Song, Jing; Alves, Tiago Marcos; Omosanya, Kamaldeen Olakunle

doi:10.1016/j.margeo.2022.106933

Cited by 3 publications

(1 citation statement)

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“…The relief map of its basal glide plane reveals local depressions, previously interpreted as craters or ooze evacuation structures (Riis et al, 2005;Lawrence and Cartwright, 2010). Above the basal glide plane, MTCs with basal striations, inner imbrications and ooze mounds suggest recurrent slope failure during ooze evacuation (Riis et al, 2005;Jing et al, 2022;Omosanya et al, 2022). Except for slide blocks along their sidewalls, these MTCs comprise transparent to chaotic seismic facies (Riis et al, 2005;Lawrence and Cartwright, 2010;Omosanya et al, 2022).…”

Section: Slide Wmentioning

confidence: 92%

Long-term slope instability induced by the reactivation of mass transport complexes: An underestimated geohazard on the Norwegian continental margin

Jing,

Alves,

Omosanya

et al. 2023

Geological Society of America Bulletin

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Submarine landslides are significant geohazards, capable of displacing large volumes of sediment from continental margins to deposit mass transport complexes (MTCs) and generate offshore tsunamis. However, the reactivation of MTCs after their initial failure has long been overlooked. By analyzing high-quality three-dimensional seismic reflection data and seismic attribute maps, as well as comparing the geometry of different MTCs, we investigate the development of long-term slope instability and its hazardous consequences on the northwest flank of the Storegga Slide on the Norwegian margin. Our results demonstrate that the reactivation of MTCs can deform both their inner structure and overlying strata, promoting the formation of sinuous channels and local slope failures on the seafloor. These findings further reveal the MTCs that are underconsolidated or comprise slide blocks may remain unstable for a long time after their initial failure, particularly when affected by slope undercutting and a corresponding reduction in lateral support. This study shows that MTC-prone sequences are more likely to comprise regions of continental slopes with long-term instability and recurring marine geohazards.

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