the article discusses the types of terraces, the causes of their occurrence; for the study of basement terraces on the territory of the CBD, a landfill was selected during the fallout of rocks from the starboard side of the basement terrace in the area of the Chegem Waterfalls; as a result of the study, it was revealed that exogenous and endogenous fracturing is traced in the morphology of the sides, and audio-visual monitoring indicates a powerful fault zone; at a preliminary in the analysis of fracturing, a design scheme of the instrument array with an algorithm for calculating stability is proposed and four methods for assessing stability are recommended.