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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


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

Sat, 20 Apr 2013, 08:25
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.

Προηγούμενες ειδήσεις

Wed, 9 Feb 2011, 06:00
CVO reported that on 14 February a M 4.3 earthquake near Mount St. Helens, felt widely throughout SW Washington and NW Oregon, was followed over the next few hours by several aftershocks up to M 2.8. The three largest aftershocks were also felt. ... Read all
Wed, 16 Jul 2008, 06:00
On 10 July, CVO lowered the Volcano Alert Level for Mount St. Helens to Normal and the Aviation Color Code to Green, following the cessation of lava-dome growth in late January and about five months with no signs of renewed activity. Earthquakes, volcanic gas emissions, and ground deformation were all at pre-eruptive background levels. ... Read all
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