Alaska earthquakes

M6.3 earthquake 99 km SSW of Atka, Alaska

A magnitude 6.3 earthquake struck 99 km SSW of Atka, Alaska on Wed, May 7, 1986, 11:43 AM HADT (20:43 UTC), 22 km (14 mi) below the surface.

A larger quake followed: M8.0 1986 Atka, Alaska Earthquake. This one was a foreshock.

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The earthquake

Magnitude: 6.3 (mw), strong
Local time: Wed, May 7, 1986, 11:43 AM HADT
UTC: 1986-05-07 20:43:31 UTC
Depth: 22.1 km (13.7 mi), shallow
Epicenter: 51.384° N, 174.809° 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 3.3 and up: at least 199 in the 60 days after this one and 1 in the 30 days before it.

After

The first 60 of at least 199.

Before

5.099 km SSW of Atka, AlaskaWed, May 7, 11:43 AM HADT · 14756 days ago · 33 km deep · 7 km away

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002tmj (also filed as gcmtb050786a, ushis3929, gcmt19860507204332, iscgem494924). Read Thu, Oct 1, 2026, 2:31 AM UTC.