Abstract
According to the results of long-term field observations and remote sensing studies, the coasts of Nagaev Bay have been forming due to both tectonic movements and rare earthquakes, which drastically accelerate slow relief-forming processes, and also to abrasion-favored slope processes. During the past decade, the eastern cliff of the bay has been subjected to intense abrasion and slope denudation processes. Unlike the southern and northern coasts, which are rocky, it consists of poorly lithified siltstone and argillite rocks and recedes onshore about 1 m/year. As a result, the territory of Magadan lessens by about 2000 m 2 every year. Relatively large rock falls and rockslides are of about 14 000 m 3 and become more significant and frequent in autumn (to the less extent in spring) due to freezing/thawing processes in surface soils. The question of what can be the cause for intense cliff destruction, whether it can be the sea level rise and/or subsidence of the rift-shaped bottom of Ghertner-Nagaev Depression, needs further investigation.
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