Permafrost controls the displacement rates of large unstable rock-slopes in subarctic environments

Determining the link between permafrost and displacement rates of large unstable rock-slopes (LURSs) is fundamental for understanding future hazard scenarios establishing appropriate management strategies. From an inventory >500 LURSs in Norway, we investigate controls those with available information on their (299 LURSs), presenting first statistical evidence as main driver LURSs. The probability a LURS to displace if present now or was during Little Ice Age (LIA) around 2.1 times higher than already absent LIA. This 1.5 current LIA that has since melted. Therefore, our findings enrich classical conception warming increases LURSs, by showing complete thawing can result decrease rate even halt displacement.