M2.7 earthquake 138 km SE of Perryville, Alaska

A magnitude 2.7 earthquake struck 138 km SE of Perryville, Alaska on Fri, Aug 27, 2021, 3:36 AM AKDT (11:36 UTC), 14 km (9 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
2.7	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
2.8	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.091 · 16 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: 116 in the 60 days after this one and at least 200 in the 30 days before it.

The first 60 of 116.

From the USGS Earthquake Hazards Program and its partner networks, event ak021azg7hti (also filed as us7000fa6g). Read Sat, Oct 3, 2026, 4:29 PM UTC.