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USGS Mount Rainier lahar zones

Lahars do not require an eruption. At Mount Rainier, large landslide-origin lahars can occur during non-eruptive periods and may arrive downstream with little conventional volcanic warning.

Source

U.S. Geological Survey

Relationship: public data source — not an endorsement or formal partnership claim.

Open official source

Limitations

  • Hazard boundaries are not lines of zero risk; hazard changes gradually across terrain.
  • This detailed Rainier layer should not be generalized to other volcanoes.
USGS lahar preparedness