Typically the mountain sees about one earthquake every two or three years. Weiss-Racine said the September increase was “interesting” but “nothing meaningful.” She explained that there are multiple indicators that a volcano might be “starting to ...

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

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.