Geohazard assessment of the Yggdrasil Power from Shore electrification project in Western Norway

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The Yggdrasil Power from Shore project aims to electrify the Yggdrasil field in the North Sea by 2027. This study highlights the research on submarine landslides conducted as part of the geohazard risk mitigation of geohazards for the 80 km inshore power cable. The resulting failure frequency of the cable was based on a quantitative assessment of the natural and manmade trigger mechanisms and is estimated based on a combination of multi-disciplinary desktop-studies, advanced earthquake analyses (e.g. FE program PLAXIS), field observations, geotechnical and geophysical ground investigations and advanced laboratory investigations. The mapping assessment identified evidence of a total of 184 prior submarine landslides along the proposed cable routing, cataloguing their geometric and morphological slide characteristics. Furthermore, a post-failure analysis was performed on the fjord flanks to estimate the slide movement energy, erosion depth and the reconsolidation ability of the soil in order to plan a repairing strategy in areas with disturbed soil. The correlation between submarine slides and earthquake activity has been assessed based on site-specific seismic analysis (PSHA) carried out as well as age dating of soil samples to estimate the expected historical and future recurrence interval of slide events.

5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)

1 - Site investigation strategies, geohazards and integrated studies