M3.4 earthquake 133 km SSE of Perryville, Alaska

A magnitude 3.4 earthquake struck 133 km SSE of Perryville, Alaska on Thu, Jul 29, 2021, 4:51 AM AKDT (12:51 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M6.9 125 km SE 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
3.4	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.5	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: at least 200 in the 60 days after this one and 137 in the 30 days before it.

The first 60 of at least 200.

From the USGS Earthquake Hazards Program and its partner networks, event ak0219nib4yv (also filed as us6000f07n). Read Sun, Oct 4, 2026, 1:49 PM UTC.