Glidning av Arnebråtveien nr. 30.
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At Arnebråtveien 30 in Aker a sliding of the clayey ground occurred in the evening of May 29th 1936. A road had been built on a foundation of stone. The ground was too weak to stand the weight of the ballast. By a sliding the ground stabilized itself in the usual manner: on a horizontal axis a flake of the ground turns, sinking in its upper part and rising in the lower one where several ridges and rolls are formed. In this case the sinking extended over a distance of 3 m along a crevice, hitting the road where a car was taken by the slide. The touched area covered 2000 sq. m. An investigation of the ground seemed to indicate that the sliding had taken place in an unstable layer at 5 m depth.