M3.9 earthquake 271 km SE of Atka, Alaska

A magnitude 3.9 earthquake struck 271 km SE of Atka, Alaska on Tue, Feb 13, 2018, 7:10 PM HAST (05:10 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.1 268 km SE of Atka, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
3.9	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.077 · 45 stations
3.4	ML, local (Richter)	Alaska Earthquake Center	Preliminary

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 4 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us2000d6yr (also filed as ak01822i85cc). Read Fri, Oct 2, 2026, 1:05 PM UTC.