This undated file photo shows inside the crater on Mount St. Helens. (Pixabay) However, there have been other periods on similar seismic activity that did not lead to eruptions, namely in 1988 ...

Mount St. Helens, which notoriously ... “Magma slowly rises through the lower crust and accumulates in a reservoir about 2.5 to 6 miles (4‒10 km) below sea level,” the USGS wrote.

VANCOUVER, Wash. (KPTV/Gray News) - Mount St. Helens, which notoriously erupted in 1980, has been showing signs of increased seismic activity lately, according to the U.S. Geological Survey.It’s ...

VANCOUVER, Wash. (KPTV/Gray News) - Mount St. Helens, which notoriously erupted in 1980, has been showing signs of increased seismic activity lately, according to the U.S. Geological Survey.It’s ...

This undated file photo shows inside the crater on Mount St. Helens. (Pixabay) However, there have been other periods on similar seismic activity that did not lead to eruptions, namely in 1988 ...

This undated file photo shows inside the crater on Mount St. Helens. (Pixabay) However, there have been other periods on similar seismic activity that did not lead to eruptions, namely in 1988 ...

This undated file photo shows inside the crater on Mount St. Helens. (Pixabay) However, there have been other periods on similar seismic activity that did not lead to eruptions, namely in 1988 ...

VANCOUVER, Wash. (KPTV/Gray News) - Mount St. Helens, which notoriously erupted in 1980, has been showing signs of increased seismic activity lately, according to the U.S. Geological Survey. It ...