M3.1 earthquake 63 km ENE of Ugashik, Alaska

A magnitude 3.1 earthquake struck 63 km ENE of Ugashik, Alaska on Thu, Apr 8, 2021, 8:47 AM AKDT (16:47 UTC), 136 km (84 mi) below the surface.

A larger quake followed: M3.7 85 km ESE of Egegik, 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
3.1	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
2.8	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.041 · 79 stations

2 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 50 in the 60 days after this one and 28 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event ak0214ich3qo (also filed as us6000e02a). Read Sun, Oct 4, 2026, 3:02 AM UTC.