Abstract
Summary Quick-clay landslides are reported from different parts of the world, specially from Nordic countries, Canada, and Russia. Quick clay is mainly observed in marine clay areas. Various geophysical methods can help mapping of potential quick-clay deposits. NGU uses frequency-domain helicopter EM (HEM) and electrical resistivity tomography (ERT) to map potential quick-clay areas in Norway. Orkdal valley in Norway is characterized by thick deposits from the ice age and deglaciation period. In 2021 NGU, in collaboration with NVE, collected HEM, ERT and ground penetrating radar (GPR) data from Orkdal valley for quick-clay mapping. We present subsurface resistivity models obtained from full 3D inversion of HEM data and its comparison with ERT along one profile. There is a general good correlation between ERT and HEM data, and also with a geotechnical drilling profile from an earlier mapped quick-clay hazard zone.
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