USGS Volcano Notice - DOI-USGS-CVO-2024-07-05T19:32:57+00:00

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: Mount St. Helens continues to experience slightly heightened seismicity than typical of recent years, with 22 located earthquakes in the last week, and 423 since Feb 1 when the current increase in seismicity began.  The largest earthquake over the past week was a magnitude 1.1, with the largest since Feb 1 a magnitude 2.0.  The average depth of earthquakes at Mount St. Helens last week was 3.2 miles below the crater, compared to an average depth of 3.8 since Feb 1. Although this level of seismicity is elevated compared to the last several years at Mount St. Helens, it is still considered within the background range and does not suggest an imminent eruption. No changes have been detected in ground deformation, volcanic gas, or thermal emissions at the volcano. Small earthquakes consistent with background-level activity were also detected at Mount Baker, Mount Rainier, and Mount Hood.