Alaska earthquakes

M4.0 earthquake 198 km WSW of Adak, Alaska

A magnitude 4.0 earthquake struck 198 km WSW of Adak, Alaska on Sat, Jun 25, 2016, 11:34 PM HADT (08:34 UTC), 76 km (47 mi) below the surface.

A larger quake followed: M5.6 269 km W of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 4.0 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, Jun 25, 2016, 11:34 PM HADT
UTC: 2016-06-26 08:34:44 UTC
Depth: 76.4 km (47.5 mi), intermediate-depth
Epicenter: 51.492° N, 179.439° 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 · ±0.077 · 45 stations
4.0	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 7.2 km horizontally, 4.8 km in depth
Magnitude uncertainty: ±0.08
Stations used: 36

Nearby

Within 100 km, magnitude 1.5 and up: 178 in the 60 days after this one and 65 in the 30 days before it.

After

The first 60 of 178.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us10005z4l (also filed as ak13705849, ak01686immjj). Read Sun, Oct 4, 2026, 11:16 PM UTC.