Stories tagged volcanoes

Mar
09
2005

Mount St Helens—the most active volcano in North America—erupted again on Tuesday, March 8, sending a cloud of ash and steam seven miles into the air. The venting began about an hour after a 2.0 magnitude earthquake shook the east side of the volcano, which has been mostly quiet since a few eruptions last September and October.

(A major eruption in 1980 killed 57 people, destroyed 200 homes, and reduced the height of the mountain's summit from 9,677 feet to 8,364 feet.)

Mount St Helen's is one of the most studied volcanoes in the world, and sensors show that lava moving into the crater left by the 1980 eruption has pushed the lava dome within the crater up by 500 feet. Scientists don't expect a major eruption, although they say that a bigger eruption could drop ash within a 10-mile radius of the crater at any time. Recent flights over the crater haven't measured high levels of gases. Instead, researchers think the volcano will continue to grow, as it did in 1986, with a series of small eruptions and a lava-dome building phase.

Video of an ash event on February 2 here

Live volcano cam at St.Helens

St. Helens Volcano Cam Image Archive.

NASA satellite images of Mount St Helens' October "hot spots".

USGS/NASA site about using Light Detection and Ranging (LIDAR) technology to study the volcano.