Six low-intensity earthquakes rumbled beneath Mount Adams during September, according to the U.S. Geological Survey Cascades Volcano Observatory. That’s an unusual amount of seismic activity at the 12,

The quakes are unusual for the volcano, where only one earthquake is typically recorded every two to three years.

Mount Adams, the long-dormant volcano in Southwest Washington, recently experienced some unusual seismic activity.

Washington’s Mount Adams has seen some pretty unusual activity as of late, the US Geological Survey (USGS) has announced. Rather than the usual one earthquake every two to three years, six occurred in the area in September alone.