"Surge in Earthquakes at Washington's 'High Threat' Volcano Prompts Urgent Investigation".

 

Researchers are investigating a notable increase in seismic activity at Mount Adams, Washington's largest active volcano. In September, six earthquakes were recorded, marking the highest monthly total since monitoring began in 1982. This is a significant jump from the usual rate of just one earthquake every two to three years.

The earthquakes, ranging in magnitude from 0.9 to 2, were detected by a single seismic station 7 miles (11 kilometers) southwest of the summit. Fortunately, none were felt at the surface. Although experts say there’s no immediate cause for alarm, they are working to better understand what’s happening beneath the volcano.

Scientists from the Cascades Volcano Observatory (CVO) and the Pacific Northwest Seismic Network (PNSN) are deploying additional seismic stations to gain more precise data on the size, depth, and location of these quakes. According to the U.S. Geological Survey (USGS), while there is no evidence that the volcano is preparing to erupt, monitoring efforts will help determine whether further action is necessary.

Mount Adams, standing over 12,000 feet tall, is part of the Cascade Range and has a history of effusive lava flows rather than explosive eruptions. However, experts warn that lahars—fast-moving flows of mud, rock, and ice—pose the greatest risk to nearby communities. These flows could occur with or without volcanic activity, especially given the weakened rock on the ice-capped summit.

Researchers will continue to analyze data from the new seismic stations, which should provide more clarity on the situation and help assess any future risks.