2004–2008 volcanic activity of Mount St. Helens

2004–2008 Volcanic Activity Of Mount St. Helens

2004–2008 volcanic activity of Mount St. Helens

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The 2004–2008 volcanic activity of Mount St. Helens has been documented as a continuous eruption with a gradual extrusion of magma at the Mount St. Helens volcano in Washington, United States. Starting in October 2004 and ceasing in January 2008, there was a gradual building of a new lava dome. The new dome did not rise above the caldera created by the 1980 eruption of Mount St. Helens.

2004 activity

On September 23, 2004, around 2:00 a.m. PDT, Mount St. Helens experienced an earthquake swarm, with about 200 small (less than magnitude 1) earthquakes occurring less than one-half mile (one kilometer) below the lava dome. Activity increased, and on September 26, the U.S. Geological Survey (USGS) and Pacific Northwest Seismograph Network issued a "notice of volcanic unrest", stating that a "hazardous event" was possible, and the U.S. Forest Service closed the mountain to all climbing. They also closed some trails in the area because of the risk of debris flows from the possible melting of the Crater Glacier in the volcanic crater.

Seismic activity continued accelerating following the USGS advisory, with earthquakes approaching magnitude 2.5 occurring at a rate of about four per minute on September 29, prompting the USGS and Pacific Northwest Seismograph Network to issue a second advisory, increasing the "alert level" to the second of three levels and warning of an increased likelihood of steam explosion or eruption from the lava dome...
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