Summary
On 30 December 2020 a quick-clay landslide occurred in Gjerdrum, Norway. Because
of the severe consequences, the Norwegian government appointed an external
expert committee to investigate the landslide. In order to investigate the changes in
the landscape that could have contributed to the destabilisation of the slopes, a wide
approach was necessary. For this, the Geological Survey of Norway (NGU) has
contributed with several GIS analyses and 3D modelling.
This report is a documentation of the methods utilised during the work done by NGU.
The data quality of the input data for the analyses and modelling are also presented.
The main results of the work are shown, but not discussed with regard to the
underlying causes and/or triggers of the landslide. Most of the results are used and
discussed in the report of the Gjerdrum committee.
