Earthquakes

U.S. Geological Survey Cascades Volcano Observatory (CVO) regularly perform repairs, upgrades, and maintenance on the monitoring equipment on Mount Rainier.

Since 1985, Mount Rainier seismicity has been monitored by the Pacific Northwest Seismic Network (PNSN) and CVO via a network of seismic stations located within 20 km (12 mi) of Rainier. Mount Rainier is one of the most seismically active volcanoes in the Washington and Oregon Cascades.

Earthquakes near Mount Rainier are continuously monitored by a network of seismometers maintained by the U.S. Geological Survey Volcano Hazards Program and the Pacific Northwest Seismic Network, a part of the University of Washington.