Mount Rainier
Mount Rainier
Between 1950 and 2018, 439,460 people climbed Mount Rainier. Approximately 84 people died in mountaineering accidents on Mount Rainier from 1947 to 2018.
Modern activity and threat
A home built in any of the probabilistically defined inundation areas on the new maps is more likely to be damaged or destroyed by a lahar than by fire... For example, a home built in an area that would be inundated every 100 years, on the average, is 27 times more likely to be damaged or destroyed by a flow than by fire. People know the danger of fire, so they buy fire insurance and they have smoke alarms, but most people are not aware of the risks of lahars, and few have applicable flood insurance.
Seismic background
Typically, up to five earthquakes are recorded monthly near the summit. Swarms of five to ten shallow earthquakes over two or three days take place from time to time, predominantly in the region of 13,000 feet (4 km) below the summit. These earthquakes are thought to be caused by the circulation of hot fluids beneath Mount Rainier. Presumably, hot springs and steam vents within Mount Rainier National Park are generated by such fluids. Seismic swarms (not initiated with a mainshock) are common features at volcanoes, and are rarely associated with eruptive activity. Rainier has had several such swarms; there were days-long swarms in 2002, 2004, 2007, 2009, 2011, 2021, and 2025. The 2025 swarm produced the largest number of events, highest rate of events, and largest amount of energy released since the monitoring began in 1982.
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