Lahar is a term for a hot or cold mixture of water and rock fragments that flows down the slopes of a volcano and typically enters a river valley.
“Volcanoes are a perfect setting for these events because of an abundance of steep, rocky rubble and a ready source of water in the form of rain, snow or ice, the observatory added. “Lahars can flow many miles downstream from the volcano, making this the most threatening hazard in the Cascades.”Federal geologists believe the South Tahoma glacier released a burst of water, starting a slide that ran under the Tahoma Creek Bridge on Nisqually-Paradise road.
Lahars can occur by rapid melting of snow and ice during eruptions, by liquefaction of large landslides , by breakout floods from crater lakes, and by erosion of fresh volcanic ash deposits during heavy rains, the observatory notes.Potential community effects of lahars Lahars and excess sediment can cause serious economic and environmental damage to river valleys and flood plains, according to the USGS. Large lahars can crush, abrade, bury, and carry away almost anything in their paths. Buildings and valuable land could be partially or completely buried. USGS described large lahars as “rivers of concrete.”
Lahars and pyroclastic density currents have been responsible for almost 40% of all fatalities related to volcanoes, according to
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