Hazard Notification System (HANS) for Volcanoes


U.S. Geological Survey
Friday, May 26, 2023, 12:20 PM PDT (Friday, May 26, 2023, 19:20 UTC)

Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal background activity levels. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon.

Past Week Observations: During the past week, small earthquakes were detected at Mount Baker, Mount Rainier, Mount St. Helens, Mount Hood, and Newberry. All monitoring data are consistent with background activity levels in the Cascade Range. The USGS continues to respond to the impacts of the May 14th debris flow at Mount St. Helens, including the loss of power to Johnston Ridge Observatory (JRO). Crews will be working on site next week to build a temporary power system at the JRO tower. The number of instruments that remain operational is sufficient to detect increased activity and provide rough earthquake locations. Permanent repairs to the road and power supply could take months or more.

The U.S. Geological Survey Cascades Volcano Observatory and the University of Washington Pacific Northwest Seismic Network continue to monitor Washington and Oregon volcanoes closely and will issue additional notifications as warranted.

Website Resources

For images, graphics, and general information on Cascade Range volcanoes: https://www.usgs.gov/observatories/cvo
For seismic information on Oregon and Washington volcanoes: http://www.pnsn.org/volcanoes
For information on USGS volcano alert levels and notifications: https://www.usgs.gov/programs/VHP/volcano-notifications-deliver-situational-information


Jon Major, Scientist-in-Charge, Cascades Volcano Observatory, jjmajor@usgs.gov

General inquiries: vhpweb@usgs.gov