Abstract
Mapping of the distribution and properties of marine clay is important in Norway due to numerous landslides in sensitive clay. The degree of leaching of salt in marine clay may be reflected by its electrical resistivity. However, the degree of sensitivity of the clay needs to be confirmed by geotechnical studies. Electrical resistivity and various electromagnetic (EM) methods are common geophysical methods to investigate the resistivity of an area. Helicopter EM surveys are helpful to investigate a large area in rather shorter time compared to ground EM or resistivity surveys. Frequency domain helicopter-borne EM (FHEM), electrical resistivity tomography (ERT) and seismic refraction were performed in 2014 at Byneset outside of Trondheim, Norway where a landslide occurred in 2012. Geotechnical surveys were performed in the region before, but mainly after the landslide. There was a good correlation between the results from the different surveys. FHEM interpretation revealed that unleached marine clay was covered by varying thickness of leached clay in the survey area. At some places, bedrock was very shallow and even exposed at the surface. FHEM is proven to be a very good tool to get an overview of the leached and unleached clay zones and to map 3D resistivity of the region.
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The authors wish to express their gratitude to Lena Persson for reviewing the article and giving insightful comments to improve the quality of it.
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Baranwal, V.C., Rønning, J.S., Solberg, IL., Dalsegg, E., Tønnesen, J.F., Long, M. (2017). Investigation of a Sensitive Clay Landslide Area Using Frequency-Domain Helicopter-Borne EM and Ground Geophysical Methods. In: Thakur, V., L'Heureux, JS., Locat, A. (eds) Landslides in Sensitive Clays. Advances in Natural and Technological Hazards Research, vol 46. Springer, Cham. https://doi.org/10.1007/978-3-319-56487-6_42
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DOI: https://doi.org/10.1007/978-3-319-56487-6_42
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