Volcano Hazards • Lahars • Rain + Ash = Mudflow • Go back to Strange Sounds Heavy rain on Mount Merapi triggered a “cold lava” flood — a lahar — surging downriver, killing people and dragging vehicles. When intense rainfall hits ash-covered slopes, loose volcanic debris turns into a fast-moving slurry that can carry boulders, […]

The post Mount Merapi “Cold Lava” Flood: What a Lahar Is and Why Rain Makes Volcano Slopes Deadly (Mar 2026) appeared first on Strange Sounds.