A global review of subaqueous spreading and its morphological and sedimentological characteristics: A database for highlighting the current state of the art

Bucci, Monica Giona; Micallef, Aaron; Urlaub, Morelia; Mountjoy, Joshu; Barrett, Rachel

doi:10.1016/j.geomorph.2022.108397

Cited by 5 publications

(1 citation statement)

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“…MTCs with closely spaced and tilted coherent blocks are observed on bathymetric and seismic data all over the mid-Norwegian margin, and also near the Storegga Slide, generating a rugged seafloor (Solheim et al, 2005a;Micallef et al, 2007). Below these blocks, seismic and sediment core data reveal a layer-parallel glide plane that propagates at present into intact layers on the upper continental slope after lateral support was lost by the undercutting of the lower continental slope (Locat et al, 2016;Giona Bucci et al, 2022). These layers comprise soft marine clays interbedded with (harder) glacial deposits, resulting in weak layers with lower shear strengths, higher sensitivity and excess pore pressures when compared to the confining strata (L'Heureux et al, 2012;Ogata et al, 2014;Locat et al, 2016;Gatter et al, 2021;Wu et al, 2022).…”

Section: Development Of Mtcs Comprising Slide Blocksmentioning

confidence: 96%

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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