The 2018 M6.4 Kaktovik earthquake generated a very energetic aftershock sequence, as is typical for crustal earthquakes. In the first hour after the mainshock there were seven aftershocks exceeding M4, including one M5.6. Then, at 1:15pm, a magnitude 6.0 aftershock struck about 20 miles east of the mainshock.

In 2019 alone, the Earthquake Center recorded nearly 2,500 aftershocks from this earthquake, with magnitudes ranging between 0.5 and 4.9. The rate of aftershocks has been steadily declining with time and is expected to continue into 2021.

Last Modified: April 25, 2024