Scientists Warn of Imminent Danger from Mount Rainier
Scientists have issued a stark warning that America's deadliest volcano could obliterate three towns, home to 60,000 residents, within minutes. The towns of Orting, Puyallup, and Sumner in Washington state face the risk of being decimated by a massive volcanic mudflow, known as a lahar, from Mount Rainier.
Mount Rainier, an active volcano in the Cascade Range, is considered the most dangerous volcano in the United States due to its heavy glacial cover and unstable volcanic rock. These conditions create the perfect setup for fast-moving lahars, which occur when water mixes with loose rock, ash, and debris on the volcano's slopes. Lahars can be triggered by landslides, severe storms, heavy rainfall, or an eruption.
Geophysicist Andy Lockhart warned that all three towns sit on the volcano's western flank, directly in the path of where a lahar, potentially hundreds of feet high, would likely flow. He emphasized that a rapidly forming 'no-notice' lahar could hit the towns within 30 minutes, leaving little time for evacuation. '[They are] the thing that goes bump in the night. It creeps me out,' Lockhart told Popular Mechanics.
Volcanologist Lizeth Caballero García from the National Autonomous University of Mexico explained that lahars are particularly dangerous because they are 'complex phenomena that change a lot during transport.' She added, 'They can grow, they can dilute.'
Preparedness and Challenges
Authorities are aware of the dangers and have spent decades researching and improving warning systems to help residents evacuate in time. The area conducts mass evacuation drills to prepare for a disaster. However, experts caution that 'no-notice' lahars remain incredibly hard to predict and can occur without clear warning signs. Climate change may exacerbate the risk by destabilizing glaciers through global warming and increasing the likelihood of severe storms, both key factors in triggering no-notice lahars.
Orting is likely to be the worst hit due to its limited evacuation routes and growing population. During a sudden evacuation, roads could become clogged, trapping people inside the lahar's path.
Monitoring and Research Efforts
The Cascades Volcano Observatory has installed numerous monitoring stations around Mount Rainier to track seismic activity and detect possible lahars in real time. Researchers have also spent years recreating lahars at a giant experimental flume in Oregon's HJ Andrews Experimental Forest to better understand mudflows. The data from these experiments feeds into models that predict how quickly lahars could hit and how much time residents might have to escape.
Mount Rainier is already the site of one of the largest lahars in U.S. history, which occurred thousands of years ago when part of the mountain collapsed, unleashing a massive mudflow. Scientists estimate it carried enough debris to fill approximately 1.5 million Olympic-sized swimming pools. The deadliest lahar in recent memory happened in 1980 when the north flank of Mount St. Helens collapsed, sending deadly pyroclastic flows of hot ash and debris more than 60 miles. Lahars are similar to pyroclastic flows in that they move rapidly with incredible force, giving those in their path little time to flee.
