Alaska earthquakes

M5.1 earthquake 89 km WNW of Atka, Alaska

A magnitude 5.1 earthquake struck 89 km WNW of Atka, Alaska on Fri, Aug 27, 1976, 4:30 PM GMT-10 (02:30 UTC), 145 km (90 mi) below the surface.

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The earthquake

Magnitude
5.1 (mb, body-wave), moderate
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1976-08-28 02:30:09 UTC
Depth
145.0 km (90.1 mi), intermediate-depth
Epicenter
52.597° N, 175.343° 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
CONSTRAINED_BY_DEPTH_PHASES
Stations used
137

Nearby

Within 100 km, magnitude 2.1 and up: 1 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 4.533 km ENE of Adak, Alaska · 18294 days ago · 116 km deep · 89 km away

Before

  1. 4.685 km ESE of Adak, Alaska · 18314 days ago · 33 km deep · 100 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000j2n. Read Fri, Oct 2, 2026, 10:07 PM UTC.