Alaska earthquakes

M4.2 earthquake 81 km SW of Adak, Alaska

A magnitude 4.2 earthquake struck 81 km SW of Adak, Alaska on Sun, Apr 29, 2018, 6:38 AM HADT (15:38 UTC), 14 km (9 mi) below the surface.

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The earthquake

Magnitude: 4.2 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Sun, Apr 29, 2018, 6:38 AM HADT
UTC: 2018-04-29 15:38:36 UTC
Depth: 13.8 km (8.6 mi), shallow
Epicenter: 51.379° N, 177.504° 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
4.2	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.049 · 117 stations
4.2	mb, body-wave	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 5.9 km horizontally, 8.1 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 187°, poorly surrounded by stations
Stations used: 78

Nearby

Within 100 km, magnitude 1.5 and up: 125 in the 60 days after this one and 46 in the 30 days before it.

After

The first 60 of 125.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000dubi (also filed as ak19294148, ak0185h240ve). Read Thu, Oct 1, 2026, 11:00 PM UTC.