Mount Rainier is an active stratovolcano 45 miles southeast of Tacoma and 60 miles south-southeast of Seattle. Its last eruption was "a light dusting of ash" in 1894, the USGS said in a report. Large eruptions haven't occurred for more than 1,000 years.

A swarm of small earthquakes was detected under the mountain triggering focused monitoring from officials. But researchers have determined there is no current threat of an eruption. The earthquake swarm started just before 1:30 a.

And since Tuesday, the active volcano has started to rumble, very lightly, after researchers detected a swam of small earthquakes that led to officials monitoring it. So, what’s going on? (Picture: Ge