Alaska earthquakes

M4.2 earthquake 183 km SSE of Atka, Alaska

A magnitude 4.2 earthquake struck 183 km SSE of Atka, Alaska on Wed, Nov 29, 2017, 8:00 AM HAST (18:00 UTC), 10 km (6 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: Wed, Nov 29, 2017, 8:00 AM HAST
UTC: 2017-11-29 18:00:05 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 50.679° N, 173.150° 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 · ±0.056 · 87 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 3.4 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.06
Depth from: Operator assigned
Station coverage gap: 195°, poorly surrounded by stations
Stations used: 110

Nearby

Within 100 km, magnitude 1.5 and up: 39 in the 60 days after this one and 1 in the 30 days before it.

After

Before

2.5175 km SSE of Atka, AlaskaThu, Nov 2, 11:20 PM HADT · 3255 days ago · 20 km deep · 25 km away

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000bw17 (also filed as ak17402695, ak017fb0oe43). Read Fri, Oct 2, 2026, 11:33 AM UTC.