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Mount St. Helens Timeline

Recent Volcanic Activity

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Mount St. Helens - Feb 2005

Mount St. Helens - Feb 2005

USGS
Just when we start to think Mount St. Helens is settling down, the volcano vents or rumbles. Here is a timeline of recent Mount St. Helens activity.

2005 to present
Mount St. Helens continues to experience low rates of seismicity, low emissions of steam and volcanic gases, minor production of ash, and the growth of a new lava dome inside the crater.

March 8, 2005
The Mount St. Helens volcano experienced a small explosive event, with the resulting steam-and-ash plume reaching an altitude of approximately 36,000 feet above sea level.

January 16, 2005
Explosive eruption that scattered ash and ballistics as large as 1 meter in the crater and ash eastward onto the volcano's east flank.

October 11, 2004 to present
New lava dome becomes evident; continues to grow and change.

October 5, 2004
The most vigorous steam-and-ash eruption since the start of unrest. It lasted over one hour. The ash rose to about 3,700 m (12,000 ft) and drifted north-northeastward. A light ash dusting fell in the towns of Morton, Randle, and Packwood, about 50 km (30 mi) away. A light dusting affected the east side of Mount Rainier National Park, 110 km (70 mi) north-northeast.

October 1, 2004
A small steam eruption, with minor ash, issued from a vent just south of the 1980-86 lava dome

September 23-25, 2004
A swarm of small, shallow earthquakes (smaller than magnitude 1) began on morning of September 23, peaked in midday on September 24, then declined through the afternoon of September 25.

Data Source: USGS/Cascades Volcano Observatory


>> Details of 1980 Mount St. Helens Activity

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