Sliding rock mass - Moving rock mass

...On gentle slopes, rock masses cannot move and cover the ground surface, forming a block field. On slopes, various phenomena develop, including sliding blocks, where individual rock masses slide slowly, debris slopes, where a large amount of debris creeps and covers the slope as a whole, blockstreams, which are flows of rock masses that accumulate in depressions and flow down, and rock glaciers with ice bodies inside. The phenomena caused by melting and stirring are collectively called frozen soil phenomena.

*Some of the terminology explanations that refer to "sliding rock mass" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…緩斜面では岩塊が移動できず，地表をおおって岩石原block fieldをつくる。斜面では個々の岩塊がゆっくり滑る滑動岩塊，多量の岩屑が全体としてクリープし斜面をおおう岩屑斜面，凹所に集積しながら流下する岩塊流blockstream，中に氷体をもつ岩石氷河などが発達する。融凍攪拌作用によるものは凍土現象として一括される。…

※「滑動岩塊」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報