More than 120 tiny earthquakes have taken place during a seven-day period recently beneath Mount St. Helens, but the U.S. Geological Survey said there are no signs of an imminent eruption. Beginning Nov. 21, the USGS said, four swarms of small quakes were detected. The tiny earthquakes were mostly too small — magnitude 0.3 or less — to be exactly located by the Pacific Northwest Seismic Network or even felt on the surface.
Geologist Liz Westby with the Cascades Volcano Observatory in Vancouver said the earthquakes occurred 1 to 2 miles down. They’re nothing of concern but more than enough to generate excitement for those monitoring the active volcano. “We’re just simply fascinated by what’s going on because we learn so much more about what’s going on beneath Mount St. Helens and what this all means,” Westby said. READ MORE