The Storegga Slide: architecture, geometry and slide development

Haflidason, Haflidi; Sejrup, Hans Petter; Nygård, Atlé; Mienert, Jürgen; Bryn, Petter; Lien, R.; Forsberg, Carl Fredrik; Berg, K.; Masson, D.G.

doi:10.1016/j.margeo.2004.10.007

Cited by 325 publications

(229 citation statements)

References 59 publications

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“…For example, Figure 2a shows a series of step like flat terraces and well defined scarps, between 2 to 6 km long and 100 to 200 m high terminating downslope in the central tributary of a canyon system. This morphology is typical of retrogressive type slope failure (Haflidason et al, 2004;Masson et al, 2009). Figure 6b on the other hand shows an area of scarps within a canyon with angles of up to 30…”

Section: Escarpmentsmentioning

confidence: 86%

Geomorphology of the Irish Rockall Trough, North Atlantic Ocean, mapped from multibeam bathymetric and backscatter Data

Sacchetti¹,

Benetti²,

Georgiopoulou

et al. 2011

Journal of Maps

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Multibeam echosounder data collected by the Irish National Seabed Survey (INSS) between 2000 and 2001 in the Rockall Trough have been used by many projects to analyze the geomorphology and the sedimentary processes of the margins of the Trough. However, due to the low spatial resolution of 150-250 m and the amount of artefacts still embedded in the publicly available data, many geomorphological features have been overlooked. This paper shows that the same multibeam dataset can provide more detailed information on seabed processes when the latest hydrographic and backscatter post-processing techniques are used to reduce data artefacts and improve data quality and spatial resolution.The resulting map, presented here at a scale of 1:450,000, is based on a semi-automatic and manual interpretation of geomorphological features highlighted using a new and improved 30 m bathymetric grid and a multibeam backscatter mosaic obtained using the GEOCODER post-processing algorithm.Overall, the map shows a complex sedimentological scenario where the Rockall Bank Mass Flow failure, the Donegal-Barra trough-mouth fan, along slope structures such as the Feni Contourite Drift and the Porcupine moat dominate the Rockall Trough flanks and basin floor. Smaller features such as canyon and gully systems, escarpments, coral mounds, volcanic mounds and iceberg scours have also been mapped in detail. In addition, the interpretation of the backscatter mosaic allows for the first time the identification of depositional lobes generated by downslope mass transport and canyon drainage systems, particularly where these features completely lose their bathymetric expression.

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Section: Escarpmentsmentioning

confidence: 86%

Geomorphology of the Irish Rockall Trough, North Atlantic Ocean, mapped from multibeam bathymetric and backscatter Data

Sacchetti¹,

Benetti²,

Georgiopoulou

et al. 2011

Journal of Maps

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“…The Storegga Slide on the continental slope off Western Norway around 8150 yr BP is one of the largest and best-studied submarine landslides on Earth (Bugge et al, 1987(Bugge et al, , 1988Haflidason et al, 2004;Bryn et al, 2005;Kvalstad et al, 2005). The landslide comprised a volume of about 2400 km 3 .…”

Section: The Storegga Submarine Landslidementioning

confidence: 99%

Dispersion of tsunamis: does it really matter?

Glimsdal

Pedersen

Harbitz

et al. 2013

Nat. Hazards Earth Syst. Sci.

192

131

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Abstract. This article focuses on the effect of dispersion in the field of tsunami modeling. Frequency dispersion in the linear long-wave limit is first briefly discussed from a theoretical point of view. A single parameter, denoted as "dispersion time", for the integrated effect of frequency dispersion is identified. This parameter depends on the wavelength, the water depth during propagation, and the propagation distance or time. Also the role of long-time asymptotes is discussed in this context. The wave generation by the two main tsunami sources, namely earthquakes and landslides, are briefly discussed with formulas for the surface response to the bottom sources. Dispersive effects are then exemplified through a semi-idealized study of a moderate-strength inverse thrust fault. Emphasis is put on the directivity, the role of the "dispersion time", the significance of the Boussinesq model employed (dispersive effect), and the effects of the transfer from bottom sources to initial surface elevation. Finally, the experience from a series of case studies, including earthquake- and landslide-generated tsunamis, is presented. The examples are taken from both historical (e.g. the 2011 Japan tsunami and the 2004 Indian Ocean tsunami) and potential tsunamis (e.g. the tsunami after the potential La Palma volcanic flank collapse). Attention is mainly given to the role of dispersion during propagation in the deep ocean and the way the accumulation of this effect relates to the "dispersion time". It turns out that this parameter is useful as a first indication as to when frequency dispersion is important, even though ambiguity with respect to the definition of the wavelength may be a problem for complex cases. Tsunamis from most landslides and moderate earthquakes tend to display dispersive behavior, at least in some directions. On the other hand, for the mega events of the last decade dispersion during deep water propagation is mostly noticeable for transoceanic propagation.

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“…Such settings are not observed along the western Svalbard margin. Turbidity currents might, however, have been initiated in association with the larger-scale slide events within the study area, in a similar way as the turbidites generated during the Holocene Storegga Slide event on the Norwegian margin (Haflidason et al 2004). Between the GDF and turbidite units, 40-50 cm thick layers of hemipelagic and meltwater deposits have accumulated in relation to interglacial and deglaciation periods, respectively (Jessen et al 2010).…”

Section: Discussionmentioning

confidence: 90%

The Cenozoic western Svalbard margin: sediment geometry and sedimentary processes in an area of ultraslow oceanic spreading

et al. 2011

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The northeastern high-latitude North Atlantic is characterised by the Bellsund and Isfjorden fans on the continental slope off west Svalbard, the asymmetrical ultraslow Knipovich spreading ridge and a 1,000 m deep rift valley. Recently collected multichannel seismic profiles and bathymetric records now provide a more complete picture of sedimentary processes and depositional environments within this region. Both downslope and alongslope sedimentary processes are identified in the study area. Turbidity currents and deposition of glacigenic debris flows are the dominating downslope processes, whereas mass failures, which are a common process on glaciated margins, appear to have been less significant. The slide debrite observed on the Bellsund Fan is most likely related to a 2.5-1.7 Ma old failure on the northwestern Barents Sea margin. The seismic records further reveal that alongslope current processes played a major role in shaping the sediment packages in the study area. Within the Knipovich rift valley and at the western rift flank accumulations as thick as 950-1,000 m are deposited. We note that oceanic basement is locally exposed within the rift valley, and that seismostratigraphic relationships indicate that fault activity along the eastern rift flank lasted until at least as recently as 1.5 Ma. A purely hemipelagic origin of the sediments in the rift valley and on the western rift flank is unlikely. We suggest that these sediments, partly, have been sourced from the western Svalbard-northwestern Barents Sea margin and into the Knipovich Ridge rift valley before continuous spreading and tectonic activity caused the sediments to be transported out of the valley and westward.

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The Storegga Slide: architecture, geometry and slide development

Cited by 325 publications

References 59 publications

Geomorphology of the Irish Rockall Trough, North Atlantic Ocean, mapped from multibeam bathymetric and backscatter Data

Geomorphology of the Irish Rockall Trough, North Atlantic Ocean, mapped from multibeam bathymetric and backscatter Data

Dispersion of tsunamis: does it really matter?

The Cenozoic western Svalbard margin: sediment geometry and sedimentary processes in an area of ultraslow oceanic spreading

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