M1.7 earthquake 50 km SW of Unalaska, Alaska

A magnitude 1.7 earthquake struck 50 km SW of Unalaska, Alaska on Tue, Jan 3, 2023, 6:41 AM AKST (15:41 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M3.9 89 km ENE of Nikolski, 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
1.7	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
0.99	ML, local (Richter)	AV	Final · ±0.137053647393048 · 6 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: 131 in the 60 days after this one and 60 in the 30 days before it.

The first 60 of 131.

From the USGS Earthquake Hazards Program and its partner networks, event ak02357sef4 (also filed as av91742241). Read Sat, Oct 3, 2026, 10:37 AM UTC.