Small earthquakes beneath Mount St. Helens are generally thought by scientists to be part of a recharge process where magma builds up beneath the volcano.

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 ...

Although earthquakes under Mount St. Helens are not uncommon, the recent seismic activity is the largest short-term increase in earthquakes since the volcano last erupted in 2008.

Mount St. Helens, which notoriously erupted in 1980, has been showing signs of increased seismic activity lately, according to the US Geological Survey.