USGS/Cascades Volcano Observatory, Vancouver, Washington

Fact Sheet:
Mount St. Helens Erupts Again: Activity from September 2004 through March 2005

-- Major, J.J., Scott, W.E., Driedger, C., and Dzurisin, D., 2005,
Mount St. Helens Erupts Again: Activity from September 2004 through March 2005, U.S. Geological Survey Fact Sheet FS2005-3036

After 18 years of relative quiescence, Mount St. Helens volcano recaptured the world’s attention when it showed signs of reawakening in September 2004. On September 23 a swarm of small (less than magnitude (M) 0), shallow (less than 1.5 miles below the surface) earthquakes began in and beneath the 1980-1986 lava dome. -- Major et.al., 2005

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03/12/07, Lyn Topinka

Fact Sheet: Mount St. Helens Erupts Again: Activity from September 2004 through March 2005

Fact Sheet:
Mount St. Helens Erupts Again: Activity from September 2004 through March 2005