Mudflow

mudslidemudslidesmud flowmudflowsmud slidemud-flowsflowedhill slidesmud
A mudflow or mud flow is a form of mass wasting involving "very rapid to extremely rapid surging flow" of debris that has become partially or fully liquified by the addition of significant amounts of water to the source material.wikipedia
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Lahar

laharsmudflowsvolcanic mudflows
Other types of mudflows include lahars (involving fine-grained pyroclastic deposits on the flanks of volcanoes) and jökulhlaups (outbursts from under glaciers or icecaps).
A lahar (, from ꦮ꧀ꦭꦲꦂ) is a violent type of mudflow or debris flow composed of a slurry of pyroclastic material, rocky debris and water.

Mass wasting

mass movementmass-wastingrotational slip
A mudflow or mud flow is a form of mass wasting involving "very rapid to extremely rapid surging flow" of debris that has become partially or fully liquified by the addition of significant amounts of water to the source material. The term incorporates earth slides, rock falls, debris flows, and mudslides, amongst other categories of hillslope mass movements.
Mass wasting, also known as slope movement or mass movement, is the geomorphic process by which soil, sand, regolith, and rock move downslope typically as a solid, continuous or discontinuous mass, largely under the force of gravity, but frequently with characteristics of a flow as in debris flows and mudflows.

Debris flow

debris flowsdebris basinbasins
Mudflows contain a significant proportion of clay, which makes them more fluid than debris flows; thus, they are able to travel farther and across lower slope angles. Floods and debris flows may also occur when strong rains on hill or mountain slopes cause extensive erosion and/or what is known as "channel scour". The term incorporates earth slides, rock falls, debris flows, and mudslides, amongst other categories of hillslope mass movements.
Media reports often use the term mudflow to describe debris flows, but true mudflows are composed mostly of grains smaller than sand.

Avalanche

avalanchesavalanchingavalanche research
Some broad mudflows are rather viscous and therefore slow; others begin very quickly and continue like an avalanche.
However, they are distinct from slushflows which have higher water content and more laminar flow, mudslides which have greater fluidity, rock slides which are often ice free, and serac collapses during an icefall.

Debris

wreckagecoarsedebris flow
Fine grainy material or soil has a smaller friction angle than a coarse sediment or a debris flow, but falling rock pieces can trigger a material flow, too.
In geology, debris usually applies to the remains of geological activity including landslides, volcanic explosions, avalanches, mudflows or Glacial lake outburst floods (Jökulhlaups) and moraine, lahars, and lava eruptions.

Landslide

landslideslandslipdebris avalanche
Landslide is a more general term than mudflow.
The term landslide or, less frequently, landslip, refers to several forms of mass wasting that include a wide range of ground movements, such as rockfalls, deep-seated slope failures, mudflows and debris flows.

1980 eruption of Mount St. Helens

1980 eruptioneruption of Mount St. Helens1980 Mount St. Helens eruption
The world's largest historic landslide (in terms of volume) occurred during the 1980 eruption of Mount St. Helens, a volcano in the Cascade Mountain Range in the State of Washington, USA.
At the same time, snow, ice and several entire glaciers on the volcano melted, forming a series of large lahars (volcanic mudslides) that reached as far as the Columbia River, nearly 50 mi to the southwest.

Flood

floodingfloodsflood control
Floods and debris flows may also occur when strong rains on hill or mountain slopes cause extensive erosion and/or what is known as "channel scour".
Mudflow

List of landslides

El Cobre dam burst and landslidelargest submarine landslideNuuanu Slide
By volume, the largest submarine landslide (the Agulhas slide off South Africa) occurred approximately 2.6 million years ago.
This list of landslides is a list of notable landslides and mudflows divided into sections by date and type.

Vargas tragedy

1999 Vargas mudslideVargas mudslides1999 mud slides
On December 14, 1999 in Vargas, Venezuela, a mudflow known as The Vargas tragedy significantly altered more than 60 kilometers (37 mi) of the coastline.
A mudslide forced Orion and his owner Mauricio Pérez to leave their home and go to a safer place.

Landslide classification

landslidesblock slidefalls
The term incorporates earth slides, rock falls, debris flows, and mudslides, amongst other categories of hillslope mass movements.
Description: "Mudflow is a very rapid to extremely rapid flow of saturated plastic debris in a channel, involving significantly greater water content relative to the source material (Plasticity index> 5%)." (Hungr et al.,2001)

Pyroclastic rock

pyroclasticvolcaniclasticpyroclastics
Other types of mudflows include lahars (involving fine-grained pyroclastic deposits on the flanks of volcanoes) and jökulhlaups (outbursts from under glaciers or icecaps).

Jökulhlaup

glacial outburst floodcatastrophic glacial floodingchaotic flooding
Other types of mudflows include lahars (involving fine-grained pyroclastic deposits on the flanks of volcanoes) and jökulhlaups (outbursts from under glaciers or icecaps).

Snow

snowfallsnow covernival
Heavy rainfall, snowmelt, or high levels of ground water flowing through cracked bedrock may trigger a movement of soil or sediments.

Groundwater

ground waterunderground waterground
Heavy rainfall, snowmelt, or high levels of ground water flowing through cracked bedrock may trigger a movement of soil or sediments.

Erosion

erodederodingerode
Floods and debris flows may also occur when strong rains on hill or mountain slopes cause extensive erosion and/or what is known as "channel scour".

Sidoarjo mud flow

Lapindo Mudflowa blow-outan unstoppable mudflow
The 2006 Sidoarjo mud flow may have been caused by rogue drilling.

Viscosity

viscousdynamic viscositykinematic viscosity
Some broad mudflows are rather viscous and therefore slow; others begin very quickly and continue like an avalanche.

Hill's Pet Nutrition

hillbluffbluffs
Mudflows are common even in the hills around Los Angeles, California, where they have destroyed many homes built on hillsides without sufficient support after fires destroy vegetation holding the land.

Los Angeles

Los Angeles, CaliforniaLos Angeles, CALA
Mudflows are common even in the hills around Los Angeles, California, where they have destroyed many homes built on hillsides without sufficient support after fires destroy vegetation holding the land.

Grain

grainsfood grainfood grains
The point where a muddy material begins to flow depends on its grain size and the water content.

Friction

coefficient of frictionstatic frictionfriction coefficient
Fine grainy material or soil has a smaller friction angle than a coarse sediment or a debris flow, but falling rock pieces can trigger a material flow, too.

Sediment

sedimentssedimentarydregs
Fine grainy material or soil has a smaller friction angle than a coarse sediment or a debris flow, but falling rock pieces can trigger a material flow, too.

Vargas (state)

VargasMiss Departamento VargasVargas state
On December 14, 1999 in Vargas, Venezuela, a mudflow known as The Vargas tragedy significantly altered more than 60 kilometers (37 mi) of the coastline.

Venezuela

🇻🇪VenezuelanVEN
On December 14, 1999 in Vargas, Venezuela, a mudflow known as The Vargas tragedy significantly altered more than 60 kilometers (37 mi) of the coastline.