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Alaska Volcano Observatory said nine volcanoes have been affected by the problem including Novarupta, which produced the biggest eruption of the 20th century.

King salmonUnited statesAlaska peninsulaSnowy mountainUkinrek maarsYves moussallamEnvironmental sciences at columbia universityKatmai national parkAlaska volcano observatoryAssistant professorEnvironmental sciencesColumbia universityTech scienceSeismic activity