Multimedia

Filter Total Items: 382
video thumbnail: Mount St. Helens: May 18, 1980
May 10, 2010

Mount St. Helens: May 18, 1980

USGS scientists recount their experiences before, during and after the May 18, 1980 eruption of Mount St. Helens. Loss of their colleague David A. Johnston and 56 others in the eruption cast a pall over one of the most dramatic geologic moments in American history.

May 10, 2010

Mount St. Helens: A Catalyst for Change

The May 18, 1980 eruption of Mount St. Helens triggered a growth in volcano science and volcano monitoring. Five USGS volcano observatories have been established since the eruption. With new technologies and improved awareness of volcanic hazards USGS scientists are helping save lives and property across the planet.

Lake elevation monitoring gage on Spirit Lake, Mount St. Helens. Do...
February 19, 2010

Lake elevation monitoring gage on Spirit Lake, Mount St. Helens. Do...

The USGS operates a real-time lake elevation monitoring gage on Spirit Lake to ensure water level does not exceed a safe limit. In 1985, the U.S. Army Corps of Engineers completed a tunnel under Harry's Ridge into the South Coldwater Creek valley to serve as the lake outlet, and to prevent the lake from rising and spilling over easily eroded debris avalanche deposits.

December 31, 2007

Time-lapse images of Mount St. Helens dome growth 2004-2008

The rapid onset of unrest at Mount St. Helens on September 23, 2004 initiated an uninterrupted lava-dome-building eruption that continued until 2008. The initial phase produced rapid growth of a lava dome as magma pushed upward. As shown in the video, an initial succession of lava spines, two recumbent and one steeply sloping, grew to nearly 500 m in length before

USGS scientist observing Mount St. Helens' crater and dome from the...
June 18, 2007

Scientist observing Mount St. Helens' crater and dome

USGS scientist observing Mount St. Helens' crater and dome from the Brutus Camera station.

December 31, 2006

Mount St. Helens 2004-2008 Eruption: A Volcano Reawakens

Mount St. Helens reawakened in late September 2004. Small magnitude earthquakes beneath the 1980-1986 lava dome increased in frequency and size, and a growing welt formed on the southeast margin of the previous lava dome and nearby portions of Crater Glacier. On October 1, 2004, the first of several explosions shot a plume of volcanic ash and gases from a vent on the