Cascade Range Current Update

Volcanoes in the Cascade Range are all at normal levels of background seismicity except Mount St. Helens. See Mount St. Helens update below.

Other volcanoes include,Mount Baker, Glacier Peak, Mount Rainier, and Mount Adams in Washington State; Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake, in Oregon; and Medicine Lake, Mount Shasta, and Lassen Peak in northern California.

USGS Cascades Volcano Observatory, the Pacific Northwest Seismograph Network at the University of Washington, and the USGS Northern California Seismic Network and Volcano Hazards Team in Menlo Park, California, monitor the major volcanoes in the Cascade Range of northern California, Oregon, and Washington.

Mount St. Helens Daily Update 9/27/04 7:00 PM PDT

Seismic activity has very slowly increased throughout the day. All earthquake locations are still shallow and beneath the dome. The largest earthquake recorded in the past 24 hours has been about a M1.5 and no M2 earthquakes have been detected in the past 24 hours. Cascades Volcano Observatory (CVO) crews installed GPS equipment today to monitor any ground movement on the dome, crater floor and the slopes of the volcano. Preliminary results from a gas flight late this afternoon did not detect any magmatic gas around the lava dome.

For past updates and yesterday’s Notice of Volcanic Unrest see past updates at: http://vulcan.wr.usgs.gov/Volcanoes/Cascades/CurrentActivity/framework.html

A few photographs of today’s fieldwork and of the volcano can be found on our website can be obtained from:
http://vulcan.wr.usgs.gov/News/framework.html

Daily updates of earthquake data and other information can be found on the WORLD WIDE WEB at URL:

http://vulcan.wr.usgs.gov/Volcanoes/MSH/CurrentActivity
(CVO Menu - Monthly Summaries and Updates)

and

http://www.pnsn.org/HELENS/welcome.html
(University of Washington - Seismic Update)



Past Updates