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DYNAMIC PARAMETERS OF LANDSLIDE FOCUS CHANGES IN CRYOLITHOZONE (BANKS ISLAND CASE STUDY)
Abstract
Landsliding is among the most massive and active exogenous processes. Now they increasingly manifest in permafrost zones due to climate change and require close attention and careful study. Analysis of the territory most prone to these processes, one of the largest islands in Northern Canada, Banks, confirmed earlier studies of landslide processes in this zone, which indicate a relationship between increased activation of landslides and abnormally warm summers. The study and assessment of the landslide focus parameters in the southern part of Banks Island showed that in 1976-1999 the development of landslides was relatively uniform. Still, after 1999 there was a sharp increase in their size. We marked two types of landslide activation: broad activations in 1999, 2011, 2012, and 2013 with a simultaneous annual descent of 20-30 landslides and occasional (local) activations with 1-2 landslides annually between the broad activations. At that, the landslide foci have random spatial distribution though these processes take place in particular geological conditions and topography. The largest landslides achieve 100 m along the slope and 50 m across the slope. There were not found new activations after 2015 within the research area. Undoubtedly, the study of the landslide frequency should be continued in the future.
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