In Rogaland county, mapping activities started in 2014. Preikestolen is one of the best known unstable slopes in Norway, and attracts hundreds of thousands of tourists every year. Measured deformation rates are extremely low and it can be expected that this tourist attraction will last for a while.

Picture: Open cracks showing deformation on Tytefjell in Tysvær municipality. Small collapses along the front of this unstable slope have historically reached the fjord (Photo by Reginald Hermanns).

Rogaland is a county in southern Norway characterized by numerous fjords and valleys surrounded by high mountain sides. These steep mountain sides have led to several large rockslides and rock avalanches since the last glaciation. NGU has started with systematic mapping in 2014 in the Vindafjord, Tysvær and Suldal municipalities. At all sites detected so far, mapping activities are ongoing and displacement measurements will start in 2015, giving first results in 2016. Therefore, it is too early to indicate if any potential high risk sites exist in Rogaland. However, open cracks in rock slopes indicate rock slope deformation that eventually can lead to failure (see picture). Mapping activities and results can soon be followed up in the database for unstable rock slopes.