Abstract
The 1930 landslide and associated 15-m high tsunami along the shore of Orkdalsfjorden, mid Norway, killed one person and caused major damage to port facilities. The combination of witness testimony with swath bathymetry data, high resolution seismic reflection data and gravity cores show that the failure propagated rapidly (up to 25 m/s) and progressively over a clay layer in a retrogressive manner. The volume of sediment evacuated downslope of the 8–12 m high and 3 km long headwall amounts 18.5 · 106 m3 during this event. The transformation of the failed mass into a sediment gravity flow caused subsequent slope failures on the opposite side of the fjord and the breakage of submarine cables at distances of 3 and 18 km away from the initial landslide.
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Acknowledgments
We thank Oddbjørn Totland and John Anders Dahl for help during data acquisition onboard the RV SEISMA (NGU). Drs. Ariane Locat and G. Lastras are acknowledged for their constructive reviews.
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L’Heureux, JS., Longva, O., Hansen, L., Vanneste, M. (2014). The 1930 Landslide in Orkdalsfjorden: Morphology and Failure Mechanism. In: Krastel, S., et al. Submarine Mass Movements and Their Consequences. Advances in Natural and Technological Hazards Research, vol 37. Springer, Cham. https://doi.org/10.1007/978-3-319-00972-8_21
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DOI: https://doi.org/10.1007/978-3-319-00972-8_21
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