2015 M6.9 Fox Islands Earthquake

The mainshock was preceded by a foreshock sequence that began 4 hours earlier with a magnitude 4 earthquake. The mainshock was followed by a vigorous aftershock sequence with hundreds of events recorded. Twenty-five aftershocks were larger than magnitude 4, including five aftershocks with magnitudes 5 or above. The largest aftershock, magnitude 5.6, occurred 3 hours after the mainshock.

Last Modified: December 31, 1969