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 2, 2023