Mount Rainier rattled by a swarm of quakes

Scores of tiny earthquakes rattled Mount Rainier this week, marking the largest swarm of earthquakes at the mountain since 2009, according to the U.S. Geological Survey.

Why it matters: Even though scientists say there's no immediate cause for alarm, the uptick in seismic activity below what USGS calls the Cascade Range's "most dangerous volcano" has researchers and locals taking note.