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St. Helens blows again
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| Contributor | Ralphie |
| Last Edited | Ralphie Mar 09, 2005 09:53am |
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| Category | News |
| Media | Newspaper - Seattle Post-Intelligencer |
| News Date | Wednesday, March 9, 2005 03:00:00 PM UTC0:0 |
| Description | Mount St. Helens spewed a gray plume of ash miles into the air yesterday, surprising scientists and enthralling onlookers with its largest show of force in months.
The eruption, which began at 5:25 p.m., lasted about 30 minutes and sent a billowing cloud about 36,000 feet into the air.
Scientists weren't sure what triggered the release, and they plan to visit the mountain today to determine what impact the explosion had on the volcano's lava dome. The explosion followed a slight rise in seismic activity, but scientists said those earthquakes did not forewarn them that the larger event was coming.
"It is the kind of eruption that we have been talking about the possibility of all along," said Carolyn Driedger, a hydrologist at the U.S. Geological Survey's Cascades Volcano Observatory.
The ash plume drifted northeast, prompting the National Weather Service to issue ash advisories for areas including the Yakima Valley and Lower Columbia Basin in Eastern Washington. Light ashfall was reported as far east as Yakima just a few hours after the explosion.
The explosion was larger than events in October, when plumes reached at least 16,000 feet. It also may have been bigger than a January emission that occurred at night. |
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