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If someone needs immediate help with volcanic lahar, use emergency mode.
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DEVELOPMENT FIXTURE — Hot mudflow from volcano is moving down river valleys toward populated areas.
The essentials if you need to act right now.
Leave river valleys now. Climb high ground away from mudflow.
What might I see? Observable signs — no diagnosis required.
DEVELOPMENT FIXTURE — Official lahar warning or sudden muddy river rise during volcanic activity.
DEVELOPMENT FIXTURE — Roaring upstream and bridges vibrating.
Optional deeper explanation — not required to act.
DEVELOPMENT FIXTURE — Lahars are volcanic mudflows that travel river channels at highway speeds.
DEVELOPMENT FIXTURE — They can occur during eruption or years later when rain mobilizes ash.
Check the scene before you approach.
Civilian-safe actions you can take.
DEVELOPMENT FIXTURE — Leave homes and roads in river valleys immediately.
DEVELOPMENT FIXTURE — Climb hillside — do not follow valley floor downstream.
DEVELOPMENT FIXTURE — Avoid all bridges over affected rivers.
DEVELOPMENT FIXTURE — Help mobility-impaired neighbors reach high ground.
When and how to get professional help.
DEVELOPMENT FIXTURE — Evacuate valleys immediately. Lahars cannot be outrun downstream.
DEVELOPMENT FIXTURE — Call 112 from high ground with location relative to river.
DEVELOPMENT FIXTURE — Report last known occupants in valley structures.
DEVELOPMENT FIXTURE — Lahar impact is often fatal — prevention through evacuation is key.
Dangerous actions, when not to attempt rescue, and common myths.
DEVELOPMENT FIXTURE — Do NOT cross bridges when muddy water rises.
DEVELOPMENT FIXTURE — Do NOT shelter in valley-floor buildings.
DEVELOPMENT FIXTURE — Lahars only happen during visible eruption
DEVELOPMENT FIXTURE — Rain on old volcanic deposits can trigger lahars years after eruption.
DEVELOPMENT FIXTURE — Communities complacent during quiet periods caught off guard.
Other scenarios in the same family.
Aftershock
DEVELOPMENT FIXTURE — The ground shakes again after the main earthquake.
Avalanche warning
DEVELOPMENT FIXTURE — Avalanche danger is high on slopes where you are traveling or living.
Buried in avalanche
DEVELOPMENT FIXTURE — You or someone nearby is buried in avalanche snow.
Compound disaster
DEVELOPMENT FIXTURE — Multiple disasters overlap — e.g. earthquake and tsunami, cyclone and flood.
DEVELOPMENT FIXTURE — Areas below volcanoes need permanent evacuation drills.