Cristin-resultat-ID: 1695950
Sist endret: 19. september 2019, 15:03
NVI-rapporteringsår: 2019
Resultat
Vitenskapelig artikkel
2019

Landslide material control on tsunami genesis ‐ The Storegga slide and tsunami (8100 y BP)

Bidragsytere:
  • Jihwan Kim
  • Finn Løvholt
  • Dieter Issler og
  • Carl Fredrik Forsberg

Tidsskrift

Journal of Geophysical Research (JGR): Oceans
ISSN 2169-9275
e-ISSN 2169-9291
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2019
Volum: 124
Hefte: 6
Sider: 3607 - 3627
Open Access

Importkilder

Scopus-ID: 2-s2.0-85067415814

Beskrivelse Beskrivelse

Tittel

Landslide material control on tsunami genesis ‐ The Storegga slide and tsunami (8100 y BP)

Sammendrag

Tsunami generation from sub‐aqueous landslides is controlled by landslide kinematics, which in turn is governed by the material properties of the slide mass. Yet, the effect of the material properties on tsunami‐genesis is poorly understood. Geomorphological observations of landslide run‐out put constraints on the landslide dynamics. In addition, observations of tsunami run‐up heights can improve our understanding of how the landslide material transforms from initiation to final run‐out. The giant prehistoric Storegga Slide off the mid‐Norwegian coast caused a well documented ocean‐wide tsunami that offers a unique setting for coupling landslide material models to tsunami generation models. In this study we simulate the dynamics of the Storegga Slide and tsunami using the depth‐averaged landslide model BingClaw, which implements visco‐plastic rheology and remolding, and couple it to a standard tsunami propagation model. A broad sensitivity study varying the landslide material strength parameters in BingClaw showed that the initial soil yield strength and remolding rate are most important for the tsunami‐genesis, but that the residual strength determined the final run‐out distance. BingClaw parameters were further optimized to obtain the observed run‐out distance and to minimize the relative error of the tsunami run‐up heights. As detailed time‐dependent three‐dimensional representations of landslide parameters cannot be determined field investigation of the landslide itself, these simulations of the Storegga Slide and tsunami can help in the selection of plausible parameter ranges for prognostic modeling in quantitative hazard assessments.

Bidragsytere

Jihwan Kim

  • Tilknyttet:
    Forfatter
    ved Offshore energi ved Norges Geotekniske Institutt
  • Tilknyttet:
    Forfatter
    ved Matematisk institutt ved Universitetet i Oslo

Finn Løvholt

  • Tilknyttet:
    Forfatter
    ved Geofarer og dynamikk ved Norges Geotekniske Institutt

Dieter Issler

  • Tilknyttet:
    Forfatter
    ved Snø- og steinskred ved Norges Geotekniske Institutt

Carl Fredrik Forsberg

  • Tilknyttet:
    Forfatter
    ved Integrerte geofag ved Norges Geotekniske Institutt
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