Alaska earthquakes

M5.1 earthquake 91 km SW of Atka, Alaska

A magnitude 5.1 earthquake struck 91 km SW of Atka, Alaska on Thu, May 8, 1986, 3:34 AM HADT (12:34 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M6.5 25 km NW of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude
5.1 (mb), moderate
Local time
UTC
1986-05-08 12:34:48 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.717° N, 175.277° 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 2.1 and up: 182 in the 60 days after this one and 81 in the 30 days before it.

After

The first 60 of 182.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002tr6. Read Tue, Sep 29, 2026, 4:43 PM UTC.