U.S. Geological Survey, Vancouver, Washington
University of Washington, Pacific Northwest Seismic
Network, Seattle, Washington
U.S. Geological Survey, Northern California Seismic Network, Menlo Park, California
CASCADES VOLCANO OBSERVATORY WEEKLY UPDATE
Friday, May 1, 2009 15:18 PDT (Friday, May 1, 2009 22:18 UTC)
Cascade Range Volcanoes Volcano Alert Level: NORMAL
Aviation Color Code: GREEN
Activity Update: All volcanoes in the Cascade Range are at normal levels of background seismicity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State; Mount Hood, Mount Jefferson, Three Sisters, Newberry Volcano, and Crater Lake, in Oregon; and Medicine Lake volcano, Mount Shasta, and Lassen Peak in northern California.
Mount St. Helens has been at Volcano Alert Level NORMAL (Aviation Color Code GREEN) since July 10, 2008.
Recent Observations: Seismicity remains at background levels at Cascades volcanoes. Maintenance crews were inactive this week owing to poor weather.
The U.S. Geological Survey and University of Washington continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted.
For additional information, background, images, and other graphics: http://vulcan.wr.usgs.gov
For seismic information on Oregon and Washington volcanoes: http://www.pnsn.org/WEBICORDER/PNSN/welcome.html
For seismic information on California volcanoes: http://earthquakes.usgs.gov/eqcenter/recenteqsus/Maps/special/California_Nevada.php
For a definition of alert levels: http://vulcan.wr.usgs.gov/Volcanoes/Cascades/CurrentActivity/volcano_warning_scheme.html
For a webcam view of Mount St. Helens: http://www.fs.fed.us/gpnf/volcanocams/msh/
Past Updates
Mount St. Helens Current Eruption Menu
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