M2.8 earthquake 85 km SSW of Atka, Alaska

A magnitude 2.8 earthquake struck 85 km SSW of Atka, Alaska on Sun, Jul 12, 2020, 4:13 AM HADT (13:13 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M3.9 30 km ESE 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
2.8	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.128 · 8 stations
2.1	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: 110 in the 60 days after this one and 67 in the 30 days before it.

The first 60 of 110.

From the USGS Earthquake Hazards Program and its partner networks, event us7000ambv (also filed as ak0208x22u6c). Read Fri, Oct 2, 2026, 2:10 PM UTC.