Short answer
Landslide is the broad category for rock, soil or debris moving downslope. Mudslide is a common informal name for a fast, wet flow of sediment and debris. USGS generally uses debris flow for that hazard, and counts it among landslide types. 1 2
Mudslide often names a kind of landslide, but the scientific term debris flow is usually more precise.
On this page
At a glance
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| Question | Landslide | Mudslide |
|---|---|---|
| Scope | Broad family of slope movements | Usually a wet, flow-like subset |
| Material | Rock, soil, debris or mixtures | Water-rich sediment and debris |
| Technical preference | Landslide with type specified | Debris flow or mudflow when accurate |
The table summarizes the cited definitions and the article’s stated scope. 1 2
What each thing is
Landslide. Downslope movement of rock, debris or earth under gravity, covering several modes of movement. 1
Mudslide. An informal term often used for a water-rich debris flow or mudflow, a particular flow-type landslide. 2
Key differences
USGS includes falls, topples, slides, spreads and flows under landslides. A debris flow behaves like a moving slurry and can carry boulders and trees; it is not simply clean liquid mud. 1 2
How to tell them apart
If material has moved down a slope, landslide is a safe umbrella term. If the mass flowed rapidly with much water and mixed debris, a debris-flow description may fit. Use official hazard reports for a specific event. 1 2
Where they overlap
A debris flow can be both a landslide and what the public calls a mudslide. Heavy rain and post-fire slopes can increase flow hazards. 1 2
Edge cases
The everyday word mudslide is used inconsistently and can describe a slide rather than a flow. Rapid landslides can look alike from a distance, and classification may require field evidence. 1 2
Why the distinction exists
A broad term covers many modes; technical subtype names help scientists describe movement, forecast risk and plan mitigation. 1 2
Common misconceptions
Not every landslide is muddy, and a debris flow can contain large rocks and woody material rather than just fine mud. 1 2
Examples
A rockfall from a cliff is a landslide but not a mudslide. A water-saturated debris flow down a burned canyon is a landslide often called a mudslide. 1 2
Sources
Sources checked October 3, 2026.
- USGS — What Is a Landslide and What Causes One?. Definition.
- USGS — What Is a Debris Flow?. Definition.