Geospatial conditions of landslide formation on the territory of Sakhalin Island

Abstract

The paper considers the conditions for the formation of landslide-prone areas of Sakhalin Island, the intensity of development and the main characteristics of landslides of various types common on the territory of Sakhalin Island. Sakhalin Island, determined by the geospatial location of the territory. It is due to the geospatial location of the territory as a result of the tectonic and geological history of its development that the present relief, in addition to extensive sedimentation basins, is represented by steeply sloping erosion-denudation and abrasion forms of macro and mesorelief with high potential energy, overlain by layered significantly dislocated and structurally disturbed terrigenous strata represented by relatively weak rocks, the accumulation of which occurred as a result of cyclic sedimentation. The tectonic and accompanying seismic activity, as well as the geologic history of the terrane formation, have led to the formation of complex engineering, geological, and hydrogeological conditions of the territory. Furthermore, the marginal position of the region determines its monsoon climate with high cyclonic activity, leading to a general high moisture content of the territory and activation of exogenous processes. Thus, due to the geospatial position of Sakhalin in the transition zone, a whole complex of natural factors of landslide formation was formed in the territory, including global factors (tectonic, climatic) and their subordinate determinants, as well as secondary (trigger) factors (geomorphologic, geological, hydrogeological, seismic), contributing to the widespread development of modern active landslides of different scales, characteristics, as well as types of landslide process and mechanism of mountain displacement.