M2.5 earthquake 152 km SW of Akhiok, Alaska

A magnitude 2.5 earthquake struck 152 km SW of Akhiok, Alaska on Sat, Aug 21, 2021, 5:26 PM AKDT (01:26 UTC), 25 km (15 mi) below the surface.

A larger quake followed: M6.9 112 km E 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
2.5	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
2.6	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.069 · 28 stations

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 168 in the 60 days after this one and at least 200 in the 30 days before it.

The first 60 of 168.

From the USGS Earthquake Hazards Program and its partner networks, event ak021ar0i95v (also filed as us6000f9hl). Read Thu, Oct 1, 2026, 2:53 AM UTC.