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Author(s):
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Isabelle Lecomte, Maksim Bano, Svein-Erik Hamran, Einar Dalsegg, Karl Magnus Nielsen, Marianne Holst Nielsen, Guilhem Douillet
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Abstract:
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On June 20th, 1996, a submarine land failure in a fjord near the village of Finneidfjord (Northern Norway) developed into a retrogressive quick clay slide encroaching 100-150 m inland, resulting in the loss of life and significant material damage. Reports in the aftermath of the slide concluded that build up of excess pore pressure was the main reason for the slide.
The geological settings at this location involve many of the processes typical for large offshore slides. As the fjord is sheltered and accessible, this location is ideal as a field laboratory for studying submarine slide hazards, as established in 2004 by the International Centre for Geohazards (ICG, Oslo) for instrumentation and site investigation techniques for evaluating submarine slope stability. Initial field campaigns since 1997 consisted of sediment coring, VHR seismic surveys, and the deployment of long term in situ instrumentation. A larger campaign is planned in 2008, including shear-wave acquisition, and to support that campaign with land data, several geophysical investigations were carried out on a beach in July 2007 in cooperation with the University of Strasbourg, including several students to teach them field practice. Seismic, GPR and resistivity were all tried, and preliminary results are presented.
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