A swarm of earthquakes began beneath Mount Rainier in Washington state at 1:29 a.m. PDT on July 8, 2025, marking the most substantial seismic activity at the volcano since 2009. According to the United States Geological Survey (USGS) and the Pacific Northwest Seismic Network (PNSN), hundreds of small earthquakes have been detected over the course of two days, with the total reaching 334 events by July 10. The largest quake in the swarm registered a magnitude of 1.7. Mount Rainier, an active volcano standing at 14,400 feet, experiences hundreds of earthquakes annually, but this recent swarm is notably larger than typical activity. Seismologists are closely monitoring the situation, though officials have stated there is no cause for concern at this time.