Mount St. Helens erupted, killing dozens and forever changing how the US monitors earthquakes. The volcano is still active but not erupting.

Color photos shot in 1980 from the cockpit of a Cessna 150 reveal the magnitude of Mount St. Helens' ash and destruction amid volcano's eruption.

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