Magma stores are recharging inside Mount St. Helens, setting off a swarm of small earthquakes since last month, according to the U.S. Geological Survey. Since the catastrophic eruption of May 18, 1980, scientists have been conducting research and collecting data on the volcano to learn more about its typical behavior. CBS affiliate KIRO reported over the last eight weeks, there have been more than 130 earthquakes located by the Pacific Northwest Seismic Network and many more that are too small to be located. Starting on March 14, a number of small earthquakes have occurred beneath the volcano, at a depth between 1.2 to 4 miles. The earthquakes have low magnitudes of 0.5 or less with the largest ...
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