Unalaska, AK – A series of earthquakes shook Unalaska starting early this morning. The largest of them, with a magnitude of 5.3, happened at 1:01 a.m. about 55 miles southwest of the island. It was followed in the next half-hour by 16 smaller quakes, according to geologist Cindy Preller of the West Coast & Alaska Tsunami Warning Center in Palmer.

Geologists call this kind of seismic event a "swarm." The jolts were preceded by three smaller quakes on Friday and Sunday. The event was of too small a magnitude to do any damage in Unalaska.