Mount Rainier was experiencing "the most significant seismic activity" at the volcano in more than 15 years as an "earthquake ...

Hundreds of small earthquakes were detected at Mount Rainier on Tuesday in the largest such swarm at the active stratovolcano ...

Over 200 earthquakes have been detected around Mount Rainier, Washington, raising eyebrows during the biggest swarm of ...

Swarms — or clusters of earthquakes that occur in the same area in quick succession — are relatively common on Mount Rainier.

Mount Rainier, the active volcano towering above southwestern Washington state, started rumbling — very lightly — on Tuesday.

The earthquakes are not currently a cause for concern, and do not indicate an impending eruption, the U.S. Geological Survey ...

On Tuesday, hundreds of earthquakes were detected, with depths ranging from 1.2 to 3.7 miles below the summit.

The quakes began just before 1:30 a.m. on Tuesday, according to the Geological Survey at the Cascade Volcano Observatory.

Swarms of 100 small Mt Rainier earthquakes were recorded recently. Read about this stratovolcano to discover 9 Amazing Facts, including its towering Mt Rainier elevation and its biodiversity.

The U.S. Geological Survey said it and other agencies were monitoring the situation and would issue additional alerts "as needed." ...