The USGS warning system that knows when rumbling volcanoes will blow their mountain tops
More than 120 volcanic eruptions have occurred in the United States in the 42 years since Mount St. Helens erupted over Washington in 1980, killing 57 and inflicting over a billion dollars in property damage. While none have been nearly as destructive, their mere presence can impact human activities and even economies hundreds of miles away. Altogether the US Geological Survey (USGS) has identified 161 geologically active volcanoes in 14 states and territories, a third of which constitute “high” or “very high” threats to their surrounding communities, and another 58 volcanoes nationwide classified as being undermonitored. The agency operates five volcano monitoring stations along the west coast to keep an eye on all but the least dangerous as part of the Survey’s Volcano Hazards Program. On average, around 60 volcanoes erupt annually, as Hawaii’s Mauna Loa is doing right now.
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