How does a mudflow differ from an earthflow?
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landslide
This 1995 landslide at La Conchita, a coastal town in California, swept away a hillside road and destroyed a number of houses.
While both earthflows and mudflows are types of landslide movements involving water-saturated material, they differ primarily in their composition, speed, and physical characteristics.
- Earthflow: This is a sheet or stream of soil and rock material that flows downslope under the influence of gravity. It is considered an intermediate stage between creep and a mudflow. Earthflows typically originate in a large basin on the upper part of a slope where debris accumulates, and their speed can vary from relatively slow to very fast depending on water content and terrain.1
- Mudflow: This is a flow consisting of water containing large amounts of suspended particles and silt. Mudflows possess higher density and viscosity than a standard streamflow, which limits how far they can travel. They are often characterized by their high speed—reaching up to 100 km (60 miles) per hour—and their ability to transport large boulders. Their deposits are poorly sorted mixtures of debris with well-defined, lobate edges.2
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