Tiny quakes ‘the heartbeat’ of Mount St. Helens

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.

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