Experts believe a Mount Rainier eruption would post a grave threat to millions who live in the southern and eastern sections of the Seattle metropolitan area.
For many, the word “eruption” brings to mind 1980 when Mount Saint Helens demonstrated that the Washington Cascades are one of the most volcanically active parts of the country.
"It's totally at a state of background activity, so we're not worried about Mount Rainier right now,” said Alex Iezzi, a research geophysicist with the U.S. Geological Survey.monitors the Cascades daily. Their infrasound and seismic sensors detect cracks and movement from below as magma is forced upward. Gas sensors signal changes in volcanic fumes, and GPS sensors monitor and measure ground deformation.
"One of the main hazards at Rainier, is it's less explosive, but it has a lot of glaciers on top of it that can melt and form these really large lahars that can move downstream into areas people live in," Iezzi said. "There's a lahar evacuation drill in the areas of Orting and Puyallup , and I think 45,000 people participated this year,” Iezzi said.
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