Alaska earthquakes

M4.0 earthquake 29 km SSE of Atka, Alaska

A magnitude 4.0 earthquake struck 29 km SSE of Atka, Alaska on Sat, Nov 12, 2016, 5:30 PM HAST (03:30 UTC), 160 km (99 mi) below the surface.

A larger quake followed: M5.0 37 km NW of Atka, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 4.0 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, Nov 12, 2016, 5:30 PM HAST
UTC: 2016-11-13 03:30:42 UTC
Depth: 159.7 km (99.2 mi), intermediate-depth
Epicenter: 51.936° N, 174.091° 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
4.0	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.106 · 24 stations
3.6	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 15.6 km horizontally, 19.5 km in depth
Magnitude uncertainty: ±0.11
Depth from: From location
Station coverage gap: 195°, poorly surrounded by stations
Stations used: 39

Nearby

Within 100 km, magnitude 1.5 and up: 37 in the 60 days after this one and 21 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us100079lk (also filed as ak14321753, ak016elyv6t0). Read Sat, Oct 3, 2026, 8:23 AM UTC.