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Quakes at Mount St. Helens Accelerate; Eruption Fears Increase
Sept. 30 (Bloomberg) -- The frequency and strength of small earthquakes occurring near Washington state's Mount St. Helens accelerated for a second day, raising expectations that the volcano may erupt for the first time in almost 20 years.
As many as four quakes a minute are taking place in the vicinity of the volcano, which sits about 100 miles (161 kilometers) south of Seattle. Scientists have recorded magnitudes as large as 3.3, the U.S. Geological Survey said at 10:30 a.m. New York time. The last magma-emitting eruption took place Oct. 21, 1986, according to the geological survey.
Scientists monitoring the mountain yesterday raised the alert level to a ``volcano advisory,'' which is the second-highest level on a three-tier scale. The warning means that an eruption is likely, though not certain.
``Were not guaranteeing an eruption,'' Cynthia Gardner of the Cascades Volcano Observatory in Vancouver, Washington said in a televised press conference yesterday. ``Our best guestimate is something that is small to moderate. What that means is that we might have fragments hurled out of the volcano.''
Fragments could be sent as far as about 3 miles, she said. Cougar, Washington, which sits less than 25 miles from Mount St. Helens, is the closest town to the volcano. Portland is about 50 miles to the south.
Scientists have said an eruption would likely be minor compared with the catastrophic event that occurred May 18, 1980. That eruption followed a 5.1 magnitude earthquake and killed 57 people. Molten lava reduced the volcano's height by 1,314 feet.
Trails on the mountain have been closed to hikers as a cautionary measure. The seismic activity recorded since Sept. 23 has been the most significant since 1986.
To contact the reporter on this story:
Jesse Westbrook in Washington at jwestbrook1@bloomberg.net.
To contact the editor responsible for this story:
Aimee Sullivan at asullivan@bloomberg.net.
Last Updated: September 30, 2004 11:49 EDT
Sept. 30 (Bloomberg) -- The frequency and strength of small earthquakes occurring near Washington state's Mount St. Helens accelerated for a second day, raising expectations that the volcano may erupt for the first time in almost 20 years.
As many as four quakes a minute are taking place in the vicinity of the volcano, which sits about 100 miles (161 kilometers) south of Seattle. Scientists have recorded magnitudes as large as 3.3, the U.S. Geological Survey said at 10:30 a.m. New York time. The last magma-emitting eruption took place Oct. 21, 1986, according to the geological survey.
Scientists monitoring the mountain yesterday raised the alert level to a ``volcano advisory,'' which is the second-highest level on a three-tier scale. The warning means that an eruption is likely, though not certain.
``Were not guaranteeing an eruption,'' Cynthia Gardner of the Cascades Volcano Observatory in Vancouver, Washington said in a televised press conference yesterday. ``Our best guestimate is something that is small to moderate. What that means is that we might have fragments hurled out of the volcano.''
Fragments could be sent as far as about 3 miles, she said. Cougar, Washington, which sits less than 25 miles from Mount St. Helens, is the closest town to the volcano. Portland is about 50 miles to the south.
Scientists have said an eruption would likely be minor compared with the catastrophic event that occurred May 18, 1980. That eruption followed a 5.1 magnitude earthquake and killed 57 people. Molten lava reduced the volcano's height by 1,314 feet.
Trails on the mountain have been closed to hikers as a cautionary measure. The seismic activity recorded since Sept. 23 has been the most significant since 1986.
To contact the reporter on this story:
Jesse Westbrook in Washington at jwestbrook1@bloomberg.net.
To contact the editor responsible for this story:
Aimee Sullivan at asullivan@bloomberg.net.
Last Updated: September 30, 2004 11:49 EDT