deep-seated landslide
Technical term in geology for a landslide where the slip surface is deep underground, often involving bedrock.
Deep-seated landslides can occur due to heavy rain or earthquakes.
地滑り is a general term for landslide, while 深層崩壊 specifically refers to deep-seated landslides involving bedrock.
Compound of 深層 (deep layer) and 崩壊 (collapse, failure). The term is used in geology to describe landslides with a deep slip surface.