The Alaska Earthquake Information Center recorded an unusual sequence of earthquakes located about 260 km (160 miles) west of St.Matthew Island that began on April 30, 2010. The mainshock, magnitude 6.5, occurred on April 30 at 23:11:44 UTC. It was preceded by a magnitude 4.3 foreshock, 1 minute earlier, and followed by a magnitude 6.3 aftershock, 5 minutes later.

The central region of the Bering Sea is virtually aseismic. making this an unusual and scientifically fascinating sequence of events.