GEOLOGY

Detailed explanation-1: -Extremely rapid landslides include rock, debris and earth fall, rock block topple, rock slide, debris slide, flow slide in granular soil or clay, debris avalanche, debris flow and rock avalanche.

Detailed explanation-2: -They usually start on steep hillsides as shallow landslides that liquefy and accelerate to speeds that are typically about 10 mph, but can exceed 35 mph. The consistency of debris flows ranges from watery mud to thick, rocky mud that can carry large items such as boulders, trees, and cars.

Detailed explanation-3: -Not all landslides are fast. Some slow-moving landslides move at a snail’s pace, stopping and starting, and not advancing more than three feet a year. While these landslides rarely cause loss of life, they can cause damage to land and property over time.

Detailed explanation-4: -Translational slides Some of the largest and most damaging landslides on Earth are translational. These landslides occur at all scales and are not self-stabilising. They can be very rapid where discontinuities are steep.