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The onset of winter storms, especially in the past week, has generated a lot of noise on seismic instrumentation in the Cascades.
Although seismic activity at most volcanoes remains at background levels, the onset of these storms has induced notable minor seismic activity at Mount Rainier. A number of repetitive, very-small-magnitude quakes, commonly observed at Rainier once winter storms appear, began a couple of weeks ago and continue.
Ongoing research attributes these quakes to slip along the bases of the volcano's glaciers, not to volcanic activity.