M2.2 earthquake 109 km SE of Ugashik, Alaska

A magnitude 2.2 earthquake struck 109 km SE of Ugashik, Alaska on Mon, Oct 18, 2021, 10:51 PM AKDT (06:51 UTC), 6 km (3 mi) below the surface.

A larger quake followed: M3.5 99 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
2.2	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
2.5	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: 127 in the 60 days after this one and 130 in the 30 days before it.

The first 60 of 127.

From the USGS Earthquake Hazards Program and its partner networks, event ak021df0sygt (also filed as us6000fvtx). Read Fri, Oct 2, 2026, 6:38 AM UTC.