The U.S. Geological Survey says the quakes all struck on Saturday and all were centered 30 to 50 miles off Adak Island, about 1,200 miles west of Anchorage.
The USGS says a 5.3-magnitude quake struck 11:45 a.m. That was followed by a 5.2-magnitude temblor at 12:20 p.m., and a 5.0 at 8:32 p.m.
A smaller 3.3 quake also hit 60 miles south of Atka in the afternoon.
The region is frequently hit by quakes, but monitoring agencies say they rarely receive reports of anyone feeling them.
By the way, the USGS did get one report each for the 5.2, the first 5.0, and the third 5.0. Which is one more report than normal for each earthquake at Adak.
Also, while you mention one weaker earthquake, there were actually over a dozen additional quakes (2.6 to 4.6) in the area since the 5.3.