M2.8 earthquake 190 km SSW of Akhiok, Alaska

A magnitude 2.8 earthquake struck 190 km SSW of Akhiok, Alaska on Sat, Aug 28, 2021, 10:38 PM AKDT (06:38 UTC), 17 km (10 mi) below the surface.

A larger quake followed: M5.6 181 km SE of Chignik, 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)	Alaska Earthquake Center	Preferred · Preliminary
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.081 · 20 stations

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 61 in the 60 days after this one and 195 in the 30 days before it.

The first 60 of 61.

From the USGS Earthquake Hazards Program and its partner networks, event ak021b2obhw1 (also filed as us7000fb8q). Read Thu, Oct 1, 2026, 2:46 PM UTC.