M2.7 earthquake 144 km SE of Perryville, Alaska

A magnitude 2.7 earthquake struck 144 km SE of Perryville, Alaska on Thu, Sep 23, 2021, 5:20 AM AKDT (13:20 UTC), 22 km (14 mi) below the surface.

A larger quake followed: M5.6 115 km SSE of Perryville, 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
2.9	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.085 · 18 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: 65 in the 60 days after this one and 104 in the 30 days before it.

The first 60 of 65.

From the USGS Earthquake Hazards Program and its partner networks, event ak021c84td4u (also filed as us6000fvsv). Read Thu, Oct 1, 2026, 8:33 AM UTC.