Geophysical Research Abstracts Vol c European Geophysical Society A - PDF by Piecebypiece

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									Geophysical Research Abstracts, Vol. 5, 10948, 2003
c European Geophysical Society 2003




A PARAMETRIC STUDY OF TSUNAMIS
GENERATED BY SUBMARINE SLIDES OFF
WESTERN NORWAY
F. Løvholt (1), C. B. Harbitz (1), K. B. Haugen (1), S. Bondevik (2)
(1) Norwegian Geotechnical Institute, (2) University of Tromsø (Finn.lovholt@ngi.no/Fax:
+47-2223-0448)

The Storegga slide is one of the largest submarine slides in the world, and occurred
about 8000 calendar years BP. Evidence of a tsunami generated by this slide event
have been found along the coast of Norway, Scotland and the Faeroe Islands. Based
on the reconstructed bathymetry of the sediments before slide release, the Storegga
slide tsunami has been simulated and compared with observed run-up heights along
the coastline of Norway. For assessment of possible future tsunamis in the slide area,
a parametric study of tsunamis generated by smaller slides has been performed. The
surface elevation is analysed along the coastline of Norway, and presented as function
of the slide dynamics, the volume and configuration of the slide as well as the posi-
tion in the bathymetry. Recent observations and analysis have indicated strongly that
the Storegga slide was a continuos retrogressive slide process. An assessment of the
effects of a retrogressive slide movement on the wave structure is finally presented.

								
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