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Volcanic mudflows, also known by their Indonesian name, lahars, are water-saturated mixtures of volcanic debris that sweep down volcanoes and valley floors far beyond. These lahars from the 1982 eruption of Galunggung volcano on the Indonesian island of Java caused extensive damage to houses and croplands. Unlike pyroclastic flows, mudflows are generally low temperature, and these houses were not ignited. Mudflows can remain a hazard long after an eruption ends as heavy rainfall redistributes tephra produced by the eruption.

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