Small Earthquakes Are Shaking The Dormant Mount St. Helens
Over the past eight weeks, more than 130 small quakes have been detected under the sleeping volcano.By Ethan Weston | May 7, 2016
Mount St. Helens — dormant since 2008 — seems to be rumbling. The U.S. Geological Survey says more than 130 small earthquakes have been detected under the volcano in the past eight weeks.
None of the earthquakes have been very big — the largest was a 1.3 on the Richter scale — and they've all been at least a mile below the surface, meaning people probably didn't feel them.
But for those who study volcanoes, this swarm of activity indicates Mount St. Helens is recharging. In other words, new magma is refilling the volcano's chamber.