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Earthquake Swarm at Mount St. Helens

Scientists don't seem too concerned
 

 

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31 Jan 11 - Lately, the area just north of the Mount St. Helens crater has been shaking again. 

The current swarm - about two miles deep - now totals between 30 and 35 over the last few days. The biggest quake, a magnitude 2.6, came on Sunday the 30th. 

Scientists don't seem too concerned. 

"In September 2004, quakes under the mountain grew from a few to thousands in a matter  of days as magma made its way up to the surface," says Glenn Farley of King 5 news. "Scientists both at the Cascades Volcano Observatory  and at the Pacific Northwest Seismic Network at UW don't think that is what's happening now.  

"These quakes are "tectonic," says Farley, "meaning they show signs of being typical of earthquakes involving shifting fault lines, not a sign of the ground being distorted by the underground forces of volcanoes." 

 




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