M3.8 earthquake 108 km SSE of Atka, Alaska

A magnitude 3.8 earthquake struck 108 km SSE of Atka, Alaska on Sun, Jan 28, 2018, 5:09 PM HAST (03:09 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.9 50 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
3.8	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.079 · 41 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: 71 in the 60 days after this one and 61 in the 30 days before it.

The first 60 of 71.

From the USGS Earthquake Hazards Program and its partner networks, event us2000czk4 (also filed as ak0181c0ff64). Read Fri, Oct 2, 2026, 3:05 AM UTC.