Alaska earthquakes

M3.5 earthquake 44 km ENE of Adak, Alaska

A magnitude 3.5 earthquake struck 44 km ENE of Adak, Alaska on Tue, Jun 28, 2016, 9:47 PM HADT (06:47 UTC), 76 km (47 mi) below the surface.

A larger quake followed: M3.7 39 km SSE of Adak, Alaska. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.5 (ML, local (Richter)), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Jun 28, 2016, 9:47 PM HADT
UTC: 2016-06-29 06:47:38 UTC
Depth: 76.0 km (47.2 mi), intermediate-depth
Epicenter: 52.016° N, 176.032° 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
3.5	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · 29 stations
3.5	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 13.1 km horizontally, 2.7 km in depth
Stations used: 29

Nearby

Within 100 km, magnitude 1.5 and up: 116 in the 60 days after this one and 59 in the 30 days before it.

After

The first 60 of 116.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us100061h5 (also filed as ak13732129, ak0168bg4kmo). Read Sun, Oct 4, 2026, 6:07 AM UTC.