Alaska earthquakes

M4.3 earthquake 140 km WSW of Adak, Alaska

A magnitude 4.3 earthquake struck 140 km WSW of Adak, Alaska on Sat, Feb 28, 1976, 1:56 AM GMT-11 (12:56 UTC), 30 km (19 mi) below the surface.

A larger quake followed: M4.7 113 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.3 (mb), light
Local time
UTC
1976-02-28 12:56:36 UTC
Depth
30.0 km (18.6 mi), shallow
Epicenter
51.419° N, 178.521° 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.

Stations used
12

Nearby

Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 4.7113 km WSW of Adak, Alaska · 18461 days ago · 54 km deep · 35 km away
  2. 4.8189 km WSW of Adak, Alaska · 18458 days ago · 58 km deep · 51 km away
  3. 4.3163 km WSW of Adak, Alaska · 18458 days ago · 64 km deep · 29 km away
  4. 4.3180 km WSW of Adak, Alaska · 18457 days ago · 64 km deep · 40 km away
  5. 4.1191 km WSW of Adak, Alaska · 18456 days ago · 63 km deep · 53 km away
  6. 4.7179 km WSW of Adak, Alaska · 18431 days ago · 64 km deep · 42 km away

Before

  1. 4.8136 km WSW of Adak, Alaska · 18469 days ago · 32 km deep · 16 km away
  2. 4.9145 km WSW of Adak, Alaska · 18479 days ago · 39 km deep · 20 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000f8p. Read Tue, Sep 22, 2026, 3:25 PM UTC.