Scientists say Mount St. Helens is showing signs of activity, but there are no signs that the volcano in southwest Washington state is likely to erupt soon.
The magma reservoir about 5 miles beneath the 8,363-foot volcano has been slowly re-pressurizing since 2008.
U.S. Geological Survey volcano seismologist Seth Moran says scientists have suspected that fresh molten rock has been recharging the volcano since the last eruption from 2004 to 2008, but they have only recently been able to confirm it.
The eruption of Mount St. Helens on May 18, 1980, killed 57 people, knocked down a forest and filled the sky and rivers with volcanic ash.
Moran says the uplift is slow, steady and subtle, measuring about the length of a thumbnail over the past six years. He says what scientists are seeing now is similar to activity that occurred in the years after the 1980 eruption.