In March 1980, a series of volcanic explosions and pyroclastic flows began at Mount St. Helens in Skamania County, Washington, United States. The phreatic blasts escalated for nearly two months …

Nov 7, 2023 · On March 16, 1980, the first sign of activity at Mount St. Helens occurred as a series of small earthquakes. On March 27, after hundreds of additional earthquakes, the volcano produced its …

Mt. St. Helens’ lateral blast devastated an area of 230 square miles (600 square km), and blew down wide swaths of forest, splintering and snapping some tree like matchsticks. The blast travelled at …

Mar 5, 2026 · The devastation of the May 1980 eruption of Mt. St. Helens and the gradual recovery of the surrounding landscape is documented in this series of satellite images from 1979—2016.

Mar 19, 2025 · Nearly 45 years after Mount St. Helens’ eruption sent almost 90 billion cubic feet of debris into the upper Toutle Valley, millions of tons of sediment still pour into the Cowlitz River...

The giant landslide at Mount St. Helens in 1980 had an effect like pulling a cork off a bottle of severely shaken soda. Once the side of the mountain was removed, the volcanic gases exploded out of the …

Feb 3, 2026 · Gas rich magma and super-heated groundwater trapped inside the volcano were suddenly released in a powerful lateral blast. In less than three minutes, 230 square miles of …

On May 18, a violent eruption began when an earthquake triggered a giant landslide that removed the northern flank of Mount St. Helens. The blast, accompanied by hot gasses, pumice, and ash, …

On May 18, 1980, people all over the world watched with awe and horror as Mount St. Helens erupted. Fifty-seven people were killed and hundreds of square miles of lush forests and wild rivers were to all …

At Mount St. Helens, the "uncorking" unleashed a tremendous, northward-directed lateral blast of rock, ash, and hot gases that devastated an area of about 230 square miles in a fan-shaped sector north …