Long-period earthquakes were seen at Mount St. Helens "months in advance of the 1980 eruption" that killed 57 people, according to the website.

The eruption of Mount St. Helens was one of the most impactful in history. But there are people who have lived alongside the volcano for millennia.

The 1980 eruption cycle made Mount St. Helens one of the most famous volcanoes in the Cascades. But it is far from the only volcano in the range.

Just on the heels of the 45th anniversary of the volcano’s eruption, the Mt. St. Helens Visitor Center reopened its doors on Saturday.

Karl Ahlen, current Corps' Project Manager for the Sediment Retention Structure, stands facing the dam's spillway on Wednesday, May 21. It was built in response to the Mount St. Helens eruption.

A group of retired US Army Corps of Engineers members reunited at the Sediment Retention Structure just three days after the 45th anniversary of the Mount St. Helens eruption.

LOS ANGELES — A mysterious and highly active undersea volcano off the Pacific Coast could erupt by the end of this year, scientists say. Nearly a mile deep and about 700 miles northwest of San ...

Mount St. Helens, the largest volcanic eruption in US history, was commemorated this weekend, 45 years after its eruption, which killed 57 people and spewed ash across 11 US states and 5 Canadian p… ...

Jessica Ball with the California Volcano Observatory joined the show to discuss the Mt. St. Helens eruption 45 years ago and if there's been any recent activity at California's volcanoes.

YAKIMA, Wash. - Inside the Yakima Valley Museum sits an exhibit, dedicated to Mount St. Helens and the historic eruption that occurred on May 18, 1980.

The eruption of Mount St. Helens was much more powerful than any hurricane, any explosion of a nuclear weapon, any. It was, it was a devastating event for southwest Washington state 44 years ago.