Volcano

Wes Peck/Flickr

Scientists monitoring Mount St. Helens confirmed Wednesday that magma is on the rise and "re-pressurizing" the volcano in southwest Washington. However, they also stress there are no signs of an imminent eruption. 

Scientists keep tabs on Mount St. Helens with seismometers and very sensitive GPS instruments. Earthquake activity is still low. The GPS stations are more revealing. They show the volcano swelling modestly.

Greg Harness/Flickr

Right before a volcano erupts, molten rock, known as magma, is moving around underneath the surface. New research suggests this liquid magma is very rare. That’s an important finding for researchers trying to predict when a volcano may erupt.

R.J. Janda

Visiting scientists from the country of Colombia have a warning for people living in the valleys below our Northwest volcanoes. Get educated about a rare but dangerous phenomenon called a "lahar."

Photo by Bill Chadwick / OSU

For the first time, we're getting to listen to the eruption of an undersea volcano off the Northwest coast. Correspondent Tom Banse got a hold of unusual recordings made at a place called Axial Seamount. It's about 300 miles out to sea from Cannon Beach, Oregon.

Photo credit Wikimedia Commons

MT. HOOD, Ore. -- Researchers at Oregon State University think they have figured out why Mt. Hood doesn’t erupt with the same bang and violence as other Cascade volcanoes. Amelia Templeton reports.