Geohazard Assessment related to Submarine Instabilities in Bjørnafjorden, Norway C.S. Forsberg, B. Carlton, M. Vanneste, C.F. Forsberg, S. Knudsen, F. Løvholt, T. Kvalstad, G. Sauvin – NGI H. Kjennbakken*, M.A. Mazhar**, S. Degago – SVV H. Haflidason – UiB Currently: * Norconsult ** COWI
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Geohazard Assessment related to Submarine Instabilities in Bjørnafjorden, NorwayC.S. Forsberg, B. Carlton, M. Vanneste, C.F. Forsberg, S. Knudsen, F. Løvholt, T. Kvalstad, G. Sauvin – NGI H. Kjennbakken*, M.A. Mazhar**, S. Degago – SVVH. Haflidason – UiB
Age dating resultsCore descriptionsEvents 1 & 2: debris flow or mud flow deposits
SummaryAs part of the geohazard assessment we conducted:1. 1D static and pseudo-static and fully dynamic slope stability analyses2. 2D slope stability analyses for 40 profiles 3. Back-analysis of a palaeolandslide;4. Landslide dynamic simulations calibrated using results from the back
analysisResults show that the soils in many locations are unstable and could cause debris flows with long runout distancesGeophysical data support this interpretationNeed more information about the timing and triggering mechanisms of the landslides
Acknowledgments
The audience for kindly listening
Dof SubSea for geophysical data acquisition
NPRA (SVV) for permission to publish this work
NGI colleagues: Dieter Issler, Jihwan Kim, Noel Boylan, Amir Kaynia