Officials are tracking the largest swarm of earthquakes in more than 15 years on Washington's Mount Rainier but say there is no indication that the cluster of quakes is cause for concern. The U.S. Geological Survey Cascades Volcano Observatory said the swarm began early Tuesday at the 14,

Hundreds of small earthquakes have rattled Mount Rainier this week in the largest swarm of tremors in more than a decade.

Hundreds of earthquakes are detected at or near Mount Rainier each year, though typical swarms are smaller than what started last night.