Comparison of Mass Wasting Processes on the Slopes of the Rockall Trough, Northeast Atlantic

Aggeliki Georgiopoulou, S Benetti, PM Shannon, Fabio Sacchetti, PDW Haughton, Laia Comas-Bru, Sebastian Krastel

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)

Abstract

The deep-water, sediment-starved Rockall Trough separates the western Irish shelf from the Rockall Bank. Both margins have narrow, steep slopes that connect the continental shelf with the deeper basin but differ in their underlying geological controls and sediment transport processes. We compare and contrast the opposing margins of the Rockall Trough and review the size, depth distribution and degree of mass wasting processes and associated geohazard risk on each margin.Rapid contourite buildup, shallow underlying abrupt basement topography and slope oversteepening due to erosion at the base of the western margin have led to large slope failures such as the Rockall Bank Slide Complex. In contrast, the eastern margin of the Rockall Trough marked the westernmost extent of the British Irish Ice Sheet, reflected on the shelf by the presence of end moraines. Sediment was delivered by meltwater discharged from the ice sheet which locally reached the shelf edge. In conjunction with the effect of erosion from bottom currents and localised slope failures, the waning of the ice sheet led to the formation of numerous canyons incising this slope. Slope failures on the eastern margin were relatively small and sediment was progressively evacuated towards the deeper basin through canyons. In contrast, mass wasting on the western margin involved larger sediment volumes. Processes resulting in mass wasting on the western margin are likely to be still active.In contrast, the eastern margin that was glacially nourished is likely to be less active with only minor mass wasting resulting from contour current scour and local canyon margin collapse.
LanguageEnglish
Title of host publicationSubmarine Mass Movements and Their Consequences, Advances in Natural and Technological Hazards Research
Place of PublicationSwitzerland
Pages471-480
Volume37
DOIs
Publication statusPublished - 2014

Fingerprint

mass wasting
trough
slope failure
canyon
ice sheet
sediment
contourite
erosion
bottom current
shelf break
scour
transport process
meltwater
basin
sediment transport
vertical distribution
continental shelf
deep water
topography
comparison

Keywords

  • Submarine landslide
  • Slope failure
  • Scarp
  • Glacial environment
  • Statistical comparison

Cite this

Georgiopoulou, A., Benetti, S., Shannon, PM., Sacchetti, F., Haughton, PDW., Comas-Bru, L., & Krastel, S. (2014). Comparison of Mass Wasting Processes on the Slopes of the Rockall Trough, Northeast Atlantic. In Submarine Mass Movements and Their Consequences, Advances in Natural and Technological Hazards Research (Vol. 37, pp. 471-480). Switzerland. https://doi.org/10.1007/978-3-319-00972-8_42
Georgiopoulou, Aggeliki ; Benetti, S ; Shannon, PM ; Sacchetti, Fabio ; Haughton, PDW ; Comas-Bru, Laia ; Krastel, Sebastian. / Comparison of Mass Wasting Processes on the Slopes of the Rockall Trough, Northeast Atlantic. Submarine Mass Movements and Their Consequences, Advances in Natural and Technological Hazards Research. Vol. 37 Switzerland, 2014. pp. 471-480
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Georgiopoulou, A, Benetti, S, Shannon, PM, Sacchetti, F, Haughton, PDW, Comas-Bru, L & Krastel, S 2014, Comparison of Mass Wasting Processes on the Slopes of the Rockall Trough, Northeast Atlantic. in Submarine Mass Movements and Their Consequences, Advances in Natural and Technological Hazards Research. vol. 37, Switzerland, pp. 471-480. https://doi.org/10.1007/978-3-319-00972-8_42

Comparison of Mass Wasting Processes on the Slopes of the Rockall Trough, Northeast Atlantic. / Georgiopoulou, Aggeliki; Benetti, S; Shannon, PM; Sacchetti, Fabio; Haughton, PDW; Comas-Bru, Laia; Krastel, Sebastian.

Submarine Mass Movements and Their Consequences, Advances in Natural and Technological Hazards Research. Vol. 37 Switzerland, 2014. p. 471-480.

Research output: Chapter in Book/Report/Conference proceedingChapter

TY - CHAP

T1 - Comparison of Mass Wasting Processes on the Slopes of the Rockall Trough, Northeast Atlantic

AU - Georgiopoulou, Aggeliki

AU - Benetti, S

AU - Shannon, PM

AU - Sacchetti, Fabio

AU - Haughton, PDW

AU - Comas-Bru, Laia

AU - Krastel, Sebastian

PY - 2014

Y1 - 2014

N2 - The deep-water, sediment-starved Rockall Trough separates the western Irish shelf from the Rockall Bank. Both margins have narrow, steep slopes that connect the continental shelf with the deeper basin but differ in their underlying geological controls and sediment transport processes. We compare and contrast the opposing margins of the Rockall Trough and review the size, depth distribution and degree of mass wasting processes and associated geohazard risk on each margin.Rapid contourite buildup, shallow underlying abrupt basement topography and slope oversteepening due to erosion at the base of the western margin have led to large slope failures such as the Rockall Bank Slide Complex. In contrast, the eastern margin of the Rockall Trough marked the westernmost extent of the British Irish Ice Sheet, reflected on the shelf by the presence of end moraines. Sediment was delivered by meltwater discharged from the ice sheet which locally reached the shelf edge. In conjunction with the effect of erosion from bottom currents and localised slope failures, the waning of the ice sheet led to the formation of numerous canyons incising this slope. Slope failures on the eastern margin were relatively small and sediment was progressively evacuated towards the deeper basin through canyons. In contrast, mass wasting on the western margin involved larger sediment volumes. Processes resulting in mass wasting on the western margin are likely to be still active.In contrast, the eastern margin that was glacially nourished is likely to be less active with only minor mass wasting resulting from contour current scour and local canyon margin collapse.

AB - The deep-water, sediment-starved Rockall Trough separates the western Irish shelf from the Rockall Bank. Both margins have narrow, steep slopes that connect the continental shelf with the deeper basin but differ in their underlying geological controls and sediment transport processes. We compare and contrast the opposing margins of the Rockall Trough and review the size, depth distribution and degree of mass wasting processes and associated geohazard risk on each margin.Rapid contourite buildup, shallow underlying abrupt basement topography and slope oversteepening due to erosion at the base of the western margin have led to large slope failures such as the Rockall Bank Slide Complex. In contrast, the eastern margin of the Rockall Trough marked the westernmost extent of the British Irish Ice Sheet, reflected on the shelf by the presence of end moraines. Sediment was delivered by meltwater discharged from the ice sheet which locally reached the shelf edge. In conjunction with the effect of erosion from bottom currents and localised slope failures, the waning of the ice sheet led to the formation of numerous canyons incising this slope. Slope failures on the eastern margin were relatively small and sediment was progressively evacuated towards the deeper basin through canyons. In contrast, mass wasting on the western margin involved larger sediment volumes. Processes resulting in mass wasting on the western margin are likely to be still active.In contrast, the eastern margin that was glacially nourished is likely to be less active with only minor mass wasting resulting from contour current scour and local canyon margin collapse.

KW - Submarine landslide

KW - Slope failure

KW - Scarp

KW - Glacial environment

KW - Statistical comparison

U2 - 10.1007/978-3-319-00972-8_42

DO - 10.1007/978-3-319-00972-8_42

M3 - Chapter

SN - 978-3-319-00972-8

VL - 37

SP - 471

EP - 480

BT - Submarine Mass Movements and Their Consequences, Advances in Natural and Technological Hazards Research

CY - Switzerland

ER -

Georgiopoulou A, Benetti S, Shannon PM, Sacchetti F, Haughton PDW, Comas-Bru L et al. Comparison of Mass Wasting Processes on the Slopes of the Rockall Trough, Northeast Atlantic. In Submarine Mass Movements and Their Consequences, Advances in Natural and Technological Hazards Research. Vol. 37. Switzerland. 2014. p. 471-480 https://doi.org/10.1007/978-3-319-00972-8_42