Landscape evolution and slide processes in a glacioisostatic rebound area; a combined marine and terrestrial approach

Lyså, Astrid; Hansen, L.F.; Christensen, Ole; L`Heureux, Jean-Sebastian; Longva, Oddvar; Olsen, Heidi A.; Sveian, Harald

doi:10.1016/j.margeo.2007.10.008

Cited by 20 publications

(20 citation statements)

References 24 publications

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“…Similar deposits dated to Al/YD are found in central Trondheimsfjorden (Rise et al, 2006;Lyså et al, 2008). The zone of acoustic blanking is interpreted as slide deposits and the postslide succession drapes the slide deposit morphology.…”

Section: Unitsupporting

confidence: 54%

“…The pockmarks observed along the channel flanks may indicate sites of groundwater outflow due to "periodically" over-pressured groundwater. Such a mechanism has also been observed in other sites along the littoral zone of Trondheimsfjorden (Lyså et al, 2008). Gas as a possible source for these pockmarks cannot be ruled-out, but seems less likely since no gas has been observed in cores or on seismic profiles in the embayment.…”

Section: Pockmarks Featuresmentioning

confidence: 68%

“…High melt-water discharges combined with rapid isostatic uplift (Fig. 2) resulted in numerous landslides and high rates of river erosion and sediment transport as also shown for other parts of Trondheimsfjorden (Bøe et al, 2003;Lyså et al, 2008). Based on seismic data (Figs.…”

Section: Early-holocenementioning

confidence: 69%

“…The general lack of slide debris in front of the slide scars may be an indication of overall low sediment strength. A combination of low sediment strength and relatively steep slopes facilitates run-out and flow dispersal towards the deep fjord basin as suggested by the finding of debris flow deposits and turbidites (proximal and distal) in the central fjord basin (Bøe et al, 2003;Lyså et al, 2008).…”

Section: Slide Scars and Mass Movement Featuresmentioning

confidence: 99%

“…based on 14 C AMS dating while the chronology for the older units is partially based on other studies in Trondheimsfjorden (Rise et al, 2006;Lyså et al, 2008).…”

Section: Stratigraphymentioning

confidence: 99%

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Development of the submarine channel in front of the Nidelva River, Trondheimsfjorden, Norway

2009

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Section: Unitsupporting

confidence: 54%

Section: Pockmarks Featuresmentioning

confidence: 68%

Section: Early-holocenementioning

confidence: 69%

Section: Slide Scars and Mass Movement Featuresmentioning

confidence: 99%

“…based on 14 C AMS dating while the chronology for the older units is partially based on other studies in Trondheimsfjorden (Rise et al, 2006;Lyså et al, 2008).…”

Section: Stratigraphymentioning

confidence: 99%

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Development of the submarine channel in front of the Nidelva River, Trondheimsfjorden, Norway

2009

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Impacts of post‐glacial rebound on landslide spatial distribution at a regional scale in northern Iceland (Skagafjörður)

Cossart

Mercier²,

Decaulne³

et al. 2013

Earth Surf Processes Landf

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International audienceIn de-glaciated areas, para-glaciation (i.e. the conditioning of landscapes by prior glaciation) has often been considered a major predisposing factor in landslide occurrence; its consequences have been particularly well identified at a fine scale (especially on bedrock jointing). Hitherto, the relative impacts of para-glaciation on hillslope dynamics at a regional scale had nevertheless not been quantified statistically. We examine Skagafjörður area (northern Iceland) where landslides are widespread (at least 108 were mapped in an area of c. 3000km2).We compare the role of para-glaciation (debuttressing, influence of post-glacial rebound) with that of classic factors (topography, lithology, etc.) in landslide occurrence and location, using a spatial analysis based on a chi-square test. On the one hand, the results highlight that landslides are over-represented in areas where post-glacial rebound was at its maximum, with a stronger concentration of landslides in the northern part of the fjord. On the other hand, the distribution of landslides did not show any clear relationship with the pattern of glacial debuttressing. Tschuprow coefficient highlights that the influence of post-glacial rebound on landslide location is higher than the combined influence of slope gradient, curvature or geological structure. This result is supported by our initial evidence for the timing of landslides in the area: most landslides occurred during the first half of the Holocene, and a period of hillslope instability was initiated when the post-glacial uplift was at its maximum. Finally, the mechanisms that link post-glacial rebound and landsliding as well as the geomorphic impacts of landslides, are discussed

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Fjord stratigraphy and processes – evidence from the NE Atlantic Fensfjorden system

Hjelstuen

Kjennbakken

Bleikli

et al. 2013

J Quaternary Science

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Fjords commonly hold sediment basins with high temporal resolution that mirror land-and marinebased processes and depositional environments during a glacial-interglacial cycle. Here, we present TOPAS seismic profiles, with a vertical resolution of <30 cm, bathymetric records and a gravity core from Fensfjorden, west Norway, which allow a detailed study of sedimentary processes and depositional environments in a NE Atlantic fjord system. Fensfjorden hosts a sediment volume of 0.70 km 3 and the sediment basins evolved reach a maximum thickness of 100 m. The basins are characterized by a lower acoustically well-laminated glacimarine unit, of Allerød and Younger Dryas age. This unit is overlain by several acoustically transparent lenses, interpreted to be slide debrites. We suggest these slide debrites to be a result of recurrent mass failures that occurred between 11 500 and 2100 cal a BP. A thin late Holocene hemipelagic unit drapes the slide debrites. During the late Holocene the sedimentation rates in Fensfjorden decreased from 0.110 to 0.040 cm a À1 and two turbidity currents occurred in the 2040-1190 cal a BP time period. This ability to map fjord processes in more detail has, furthermore, made it possible to revise the established stratigraphical framework for NE Atlantic fjords.

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Landscape evolution and slide processes in a glacioisostatic rebound area; a combined marine and terrestrial approach

Cited by 20 publications

References 24 publications

Development of the submarine channel in front of the Nidelva River, Trondheimsfjorden, Norway

Development of the submarine channel in front of the Nidelva River, Trondheimsfjorden, Norway

Impacts of post‐glacial rebound on landslide spatial distribution at a regional scale in northern Iceland (Skagafjörður)

Fjord stratigraphy and processes – evidence from the NE Atlantic Fensfjorden system

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