noun
fault gouge; fault clay
Geological term for fine-grained, clay-rich material formed by grinding along a fault plane.
断層粘土は、断層運動によって岩石が粉砕されて生じる。
Fault gouge is produced by the crushing of rocks due to fault movement.
断層 means 'fault' (geological), while 断層粘土 specifically refers to the clayey material found in fault zones.
Compound of 断層 (fault) and 粘土 (clay), directly describing the material.