A swarm of small earthquakes began early Tuesday morning beneath Mount Rainier, with more than several hundred minor tremors recorded as of midday, according to scientists with the U.S. Geological Survey and the University of Washington.
The activity began at 1:29 a.m. on July 8 and was detected by the Cascades Volcano Observatory (CVO) and the Pacific Northwest Seismic Network (PNSN).
Researchers said the ongoing swarm is larger than the typical one or two smaller swarms that occur at the volcano each year…