Alaska earthquakes

M3.7 earthquake 35 km ENE of Atka, Alaska

A magnitude 3.7 earthquake struck 35 km ENE of Atka, Alaska on Tue, Aug 9, 2016, 1:25 AM HADT (10:25 UTC), 175 km (109 mi) below the surface.

A larger quake followed: M4.8 88 km SSE of Atka, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.7 (mb, body-wave), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Aug 9, 2016, 1:25 AM HADT
UTC: 2016-08-09 10:25:49 UTC
Depth: 175.0 km (108.7 mi), intermediate-depth
Epicenter: 52.287° N, 173.708° 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
3.7	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.168 · 9 stations
2.5	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 11.8 km horizontally, 4.3 km in depth
Magnitude uncertainty: ±0.17
Stations used: 29

Nearby

Within 100 km, magnitude 1.5 and up: 64 in the 60 days after this one and 42 in the 30 days before it.

After

The first 60 of 64.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us10006ccw (also filed as ak13838541, ak016a7beudv). Read Sat, Oct 3, 2026, 8:25 PM UTC.