Alaska earthquakes

M5.4 earthquake 46 km WNW of Atka, Alaska

A magnitude 5.4 earthquake struck 46 km WNW of Atka, Alaska on Sat, Jun 28, 1986, 7:30 PM HADT (04:30 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.5 88 km WSW of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 5.4 (mw), moderate
Local time: Sat, Jun 28, 1986, 7:30 PM HADT
UTC: 1986-06-29 04:30:03 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 52.330° N, 174.850° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Depth from: OPERATOR_ASSIGNED

Nearby

Within 100 km, magnitude 2.4 and up: 13 in the 60 days after this one and 14 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002vhc (also filed as gcmtb062986a, gcmt19860629043003, iscgem494205). Read Tue, Sep 22, 2026, 10:27 PM UTC.