Researchers find evidence for a cold, serpentinized mantle wedge beneath Mt. St. Helens

It's been more than 35 years since the last major eruption of Mount St. Helens. Since that blast, much research has been conducted with scientists learning a great deal about one of the most active volcanoes within the Cascade arc, a North-South chain of volcanoes in the Pacific Northwest that formed above the subducting Juan de Fuca plate.