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, October 31, 2008 09:51 PDT (Friday, October 31, 2008 16:51 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, a change assigned 5-6 months after the late January cessation of its 2004-2008 eruption.
Crews were in the field this week at Mount St. Helens to continue winterization and maintenance of monitoring and telemetry sites, and to complete collection of spring-water samples for annual geochemical monitoring. A trip to continuous GPS station WIFC in the Three Sisters replaced a damaged cable that was causing episodic data-transmission drop outs.
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/
Telephone recordings with the latest update on Mount St. Helens and phone contacts for additional information can be heard by calling: (360) 891-5180.
Mount St. Helens Current Eruption Menu