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Random pictures
Mount St. Helens volcano
stratovolcano 2549 m / 8,363 ft
Washington, USA (mainland exept Alaska), 46.2°N / -122.18°W
Current status: normal or dormant (1 out of 5)
Mount St. Helens webcams / live data | Reports
Mount St. Helens volcano books
Mount St. Helens volcano eruptions:
2004-08, 1990-91, 1989-90, 1980-86 (18 May 1980: Plinian eruption), 1921(?), 1903(?), 1898(?), 1857, 1854, 1853, 1850, 1849(?), 1848, 1847, 1842-45, 1835, 1831
Typical eruption style:
Explosive
Last earthquakes nearby
Latest satellite images
Satellite images of Mt.St. Helens by (c) Google Earth View
Satellite images of Mt.St. Helens by (c) Google Earth View
Mt. St. Helens in Sept. 2005, seen from the N with its grand amphitheatre left by the collapse during the 18 May, 1980 eruption (photo courtesy: W Heise).
Mt. St. Helens in Sept. 2005, seen from the N with its grand amphitheatre left by the collapse during the 18 May, 1980 eruption (photo courtesy: W Heise).
 

Mt. St. Helens volcano updates:

Mount St. Helens volcano (Washington, USA (mainland exept Alaska)) activity update

Saturday Apr 20, 2013 08:25 AM | BY: T

(Very) tiny earthquakes occur regularly at the volcano, but nothing suggests anything unusual going on at the volcano for the moment.
Previous news
Thursday, Feb 21, 2008
During 13-19 February lava-dome growth at Mount St. Helens continued. ... [more]
Wednesday, Feb 06, 2008
At 23-29 January lava-dome growth at Mount St. Helens continued. A steam plume that rose from the dome and slightly above the crater rim was visible on 25 January. [more]
Saturday, Nov 03, 2007
Deformation-monitoring instruments indicated that during
24-30 October lava-dome growth at Mount St. Helens continued. [more]
Thursday, Sep 27, 2007
From 19-25 September lava-dome growth at Mount St. Helens continued. [more]
Friday, Sep 14, 2007
No significant changes have been registered at Mt. St. Helens. CVO's instruments monitoring the volcano indicate that the lava dome continues be active and grow slowly. [more]

Background

Prior to the 1980 eruption, Mount St. Helens formed a conical, youthful volcano sometimes called the Fuji-san of America. During the 1980 eruption the upper 400 m of the summit was removed by collapse of the slope, that left a 2 x 3.5 km horseshoe-shaped crater now partially filled by a lava dome. Mount St. Helens is a very young volcano and only about 40-50,000 years old.
It has been the most active volcano in the Cascade Range during the past 10,000 years, and the modern edifice was constructed during the last 2,200 years, when the volcano produced basaltic as well as andesitic and dacitic products from summit and flank vents. Historical eruptions in the 19th century were witnessed by early settlers.


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Sources:

USGS Cascades Volcano Observatory
St. Helens Information from the Global Volcanism Program


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