Over 200 earthquakes have been detected around Mount Rainier, Washington, raising eyebrows during the biggest swarm of tremors in nearly two decades.

Mount Rainier experienced a significant earthquake swarm, the largest since 2009, with hundreds of small quakes detected near the summit. Experts attribute the tremors to hydrothermal fluids interacting with pre-existing faults beneath the volcano.

One of the most famous mountains in Washington, Mount Rainier, has been rumbling over the last day due to the amplified seismic activity.