A fast-moving flow of mud, water and debris down a slope, triggered by heavy rain on steep terrain.
phenomenaWhat is Mudslide (Lahar/Debris Flow)?
Lahars (volcanic mudflows) are a specific danger near active volcanoes in Indonesia and the Philippines. They can be triggered by heavy rain on volcanic ash deposits even without an eruption. Non-volcanic debris flows occur throughout the region on deforested hillsides during peak monsoon. Velocities can exceed 50 km/h, making them extremely dangerous because they move faster than people can run.
Key points
- A fast-moving flow of mud, water and debris down a slope, triggered by heavy rain on steep terrain.
- Category: phenomena
Related terms
See also: mudslide is connected to other weather concepts. Browse the full glossary for related definitions.