An earthquake swarm began at Mount Rainier on Tuesday (July 8), with the region hit by more than 300 small quakes, the most significant seismicity at the volcano since 2009, the US Geological Survey (USGS) reported.
The Pacific Northwest Seismic Network (PNSN), Cascades Volcano Observatory Public Information Officer Holly Weiss-Racine told USA Today that a total of 334 earthquakes had been identified at Mount Rainier as of Thursday, July 10. This swarm consists of hundreds of very small earthquakes, with the largest so far being a magnitude 2.3 on July 8.
