Alaska earthquakes

M4.7 earthquake 244 km WSW of Adak, Alaska

A magnitude 4.7 earthquake struck 244 km WSW of Adak, Alaska on Tue, Jan 21, 2020, 6:07 PM GMT-12 (06:07 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M6.1 240 km WSW of Adak, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 4.7 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Jan 21, 2020, 6:07 PM GMT-12
UTC: 2020-01-22 06:07:16 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 50.868° N, 179.756° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

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
4.7	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.029 · 360 stations
4.3	ML, local (Richter)	Alaska Earthquake Center	Preliminary

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.4 km horizontally, 1.8 km in depth
Magnitude uncertainty: ±0.03
Depth from: Operator assigned
Station coverage gap: 139°
Stations used: 123

Nearby

Within 100 km, magnitude 1.7 and up: 196 in the 60 days after this one and 27 in the 30 days before it.

After

The first 60 of 196.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60007cmf (also filed as ak02010hfrxu). Read Thu, Oct 1, 2026, 10:36 AM UTC.