Mount St. Helens and Spirit Lake before the devastating 1980 eruption. Already one of the world’s the most studied volcanos, it now host to the largest number of seismometers ever placed on a U.S. volcano.
Mount St. Helens and Spirit Lake before the devastating 1980 eruption. Already one of the world’s the most studied volcanos, it now host to the largest number of seismometers ever placed on a U.S. volcano. United States Geological Survey Associated Press file
Mount St. Helens and Spirit Lake before the devastating 1980 eruption. Already one of the world’s the most studied volcanos, it now host to the largest number of seismometers ever placed on a U.S. volcano. United States Geological Survey Associated Press file

Scientists listen in for secrets of Mount St. Helens’ inner workings

September 14, 2017 8:40 AM