Fifty-seven people were killed in the eruption of Mount St. Helens on May 18, 1980.
SKAMANIA COUNTY, Wash. — The May 18, 1980, eruption of Mount St. Helens triggered the largest landslide in recorded history, claiming 57 lives and changing the landscape for miles.
It prompted a change in seismic monitoring in the Pacific Northwest.
“Mount St Helens was really a game changer for understanding what we could do about volcanic eruptions,” said Harold Tobin, director of the Pacific Northwest Seismic Network at the University of Washington.
Tobin said in 1980, the state had about a dozen seismometers monitoring seismic activity in
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