Alaska earthquakes

M4.8 earthquake 136 km WSW of Adak, Alaska

A magnitude 4.8 earthquake struck 136 km WSW of Adak, Alaska on Fri, Feb 27, 1976, 10:43 PM GMT-11 (09:43 UTC), 32 km (20 mi) below the surface.

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The earthquake

Magnitude
4.8 (mb), light
Local time
UTC
1976-02-28 09:43:58 UTC
Depth
32.0 km (19.9 mi), shallow
Epicenter
51.562° N, 178.541° 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
36

Nearby

Within 100 km, magnitude 1.8 and up: 7 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 4.3140 km WSW of Adak, Alaska · 18470 days ago · 30 km deep · 16 km away
  2. 4.7113 km WSW of Adak, Alaska · 18462 days ago · 54 km deep · 43 km away
  3. 4.8189 km WSW of Adak, Alaska · 18459 days ago · 58 km deep · 61 km away
  4. 4.3163 km WSW of Adak, Alaska · 18459 days ago · 64 km deep · 27 km away
  5. 4.3180 km WSW of Adak, Alaska · 18458 days ago · 64 km deep · 45 km away
  6. 4.1191 km WSW of Adak, Alaska · 18457 days ago · 63 km deep · 62 km away
  7. 4.7179 km WSW of Adak, Alaska · 18432 days ago · 64 km deep · 43 km away

Before

  1. 4.9145 km WSW of Adak, Alaska · 18480 days ago · 39 km deep · 9 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000f8j. Read Wed, Sep 23, 2026, 2:06 PM UTC.