mass movement of material mostly finer than sand, along with some rock debris, lubricated with large amounts of water. The water tends to make mudflows move faster than earthflows or debris flows.
A well-mixed mass of water and alluvium which, because of its high viscosity and low fluidity as compared with water, moves at a much slower rate, usually piling up and spreading over the fan like a sheet of wet mortar or concrete. (Woolley, 1946, p. 75.)
A downslope movement of mud at slow to moderate speed.
mixture of soil and water that moves at varying speed down a hillside. The source of the water can be from rainfall or snowmelt. When volcanic ash deposits mix with water, the mudflow is called a lahar.
A type of mass movement composed mainly of clay-size materials with a high enough water content that it flows readily.
a type of debris flow which contains a high amount of water, clays, and silts, usually along with larger material
A flowing mixture of mud and water.
A water-saturated mass of rock debris that moves downslope as a liquid under the pull of gravity; it can travel many tens of miles beyond its source.
a flowing mixture of water saturated mud and debris
a mass of water saturated rock debris, typically containing a wide variety of particle sizes, that moves down a slope as a fluid under influence of gravity
an earthflow consisting of material that is wet enough to flow rapidly
a tongue of mud that slides downhill
a type of debris flow with clastic particles of sand size and finer
a landslide consisting of soil mixed with water. It is wetter than the material in an earthflow.
a flow of heterogeneous debris or sediment lubricated by a large amount of water.
Also known as lahars. They are concentrated slurries of volcanic debris and water. They form during and after heavy rainfall on the upper slopes of the volcano where deposits of volcanic ash and fragments of dome-rock lie.
A flowage of water-saturated earth material possessing a high degree of fluidity during movement. A less-saturated flowing mass is often called a debris flow. A mudflow originating on the flank of a volcano is properly called a lahar.
See debris flow.
Same as debris flow.
Also called lahars. A concentrated slurry of volcanic debris and water that occurs on many volcanoes particularly during eruptions and after very heavy rain
A flowing slurry of water, rock and mud.
A flowing mixture of water and debris (intermediate between a volcanic avalanche and a water flood) that forms on the slopes of a volcano. Sometimes called a debris flow or lahar, a term from Indonesia where volcanic mudflows are a major hazard.
a flow of fine-grained, water saturated sediment in a stream channel. Common name for lahar.
A general term for a mass-movement landform and a process characterized by a flowing mass of predominantly fine-grained material mixed with water (mud).
when a slope is so heavily saturated with water that it rushes downhill as a muddy river, carrying down debris and spreading out at the base of the slope; the fastest, wettest flow of weathered material down a hillside
Form of mass movement where fine textured sediments and soil mix with water to create a liquid flow.
A dense, highly viscous flowing mass of predominantly fine-grained earthy material, with water content approximately 20% by weight (or approximately 40% by volume). Their high density and viscosity allow mudflows to travel at speeds of more than 10 m sâˆ’1 in mountain canyons, and to carry very large boulders on low gradients.
a general term for a mass-movement landform and process characterized by a flowing mass of fine-grained earth material with a high degree of fluidity. The water content may range up to 60%; also spelled mudflow. AGI
a flowing mass of fine-grained earth material. [AHDOS
A mudflow (also called a debris flow or lahar) is a moving mixture of rock, water, and other debris. 1,000,000
A mudflow or mudslide is the most rapid (up to 80 km/h) and fluid type of downhill mass wasting. Similar terms are debris flow (e.g. in high mountains), mudslide (not very liquid) and mud stream (e.g. from volcanoes; see also lahar).