VANCOUVER, Wash. (AP) — Scientists at the U.S. Geological Survey's volcano observatory here were getting ready to head home when the squiggly line on the computer which tracks seismic activity at Mount St. Helens suddenly turned a solid black.
Latest News Reports
Mount St. Helens: Its bark was worse than its bite
from The Portland Oregonian
Big burst from St. Helens
2005-Mar-09 13:26 (updated)
from The Seattle Times
Mount St. Helens cranked up the drama yesterday, sending a plume of ash and steam 36,000 feet in the air shortly before sunset.
Clearly visible from Portland, the cloud was at least as big as any since the volcano rumbled back to life in late September.
Mount St. Helens lava dome intact
from KING (ch.5) Seattle
VANCOUVER, Wash. - Scientists are taking a look at the crater of Mount St. Helens to see what happened in Tuesday's steam burst.
The U.S. Geological Survey's Jon Major told a news conference Wednesday the lava dome is "remarkably intact." He said there was no lava flow, no mudflow and there is no hazard beyond the mountain itself.
Growth of the new lava dome inside the crater of Mount St. Helens continues, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. During such eruptions, episodic changes in the level of activity can occur over days to months. The eruption could also intensify suddenly or with little warning and produce explosions that cause hazardous conditions within several miles of the crater and farther downwind. Small lahars could suddenly descend the Toutle River if triggered by heavy rain or by interaction of hot rocks with snow and ice. These lahars pose a negligible hazard below the Sediment Retention Structure (SRS) but could pose a hazard along the river channel upstream.
Potential ash hazards to aviation: Under current eruptive conditions, small, short-lived explosions may produce ash clouds that exceed 30,000 feet in altitude. Ash from such events can travel 100 miles or more downwind.
The U.S. Geological Survey and the University of Washington continue to monitor the situation closely and will issue additional updates and changes in alert level as warranted.
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