USGS Volcano Hazards Program Volcano Update

CVO update page and observatory web site

Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal levels of background seismicity. 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 Volcano, and Crater Lake in Oregon.

Recent Observations: Earthquakes south of Mount Hood continued to occur over the last week, although at a reduced rate (just 5 earthquakes were located by the PNSN). Earthquakes in the cluster northwest of Mount St. Helens also continued to occur (16 total over the last week), with the largest a M 2.5 on 08/30. Small earthquakes and swarms are common in these areas and these events are not interpreted to be unusual.

Field crews performed site reconnaissance and geologic mapping at Glacier Peak this week.

The U.S. Geological Survey Cascades Volcano Observatory and the University of Washington continue to monitor the Washington and Oregon volcanoes closely and will issue additional updates and changes in alert level as warranted.

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Update in Common Alerting Protocol (CAP) format