Alaska earthquakes

M4.8 earthquake 191 km WSW of Adak, Alaska

A magnitude 4.8 earthquake struck 191 km WSW of Adak, Alaska on Tue, May 23, 1978, 11:23 PM GMT-10 (09:23 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.4 196 km WSW of Adak, Alaska. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
4.8 (mb), light
Local time
UTC
1978-05-24 09:23:56 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.202° N, 179.183° 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
Stations used
57

Nearby

Within 100 km, magnitude 1.8 and up: 14 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 4.3178 km WSW of Adak, Alaska · 17653 days ago · 33 km deep · 21 km away
  2. 4.2199 km WSW of Adak, Alaska · 17653 days ago · 33 km deep · 24 km away
  3. 5.4196 km WSW of Adak, Alaska · 17653 days ago · 33 km deep · 8 km away
  4. 4.1201 km WSW of Adak, Alaska · 17653 days ago · 33 km deep · 16 km away
  5. 3.9174 km W of Adak, Alaska · 17653 days ago · 33 km deep · 58 km away
  6. 4.8198 km WSW of Adak, Alaska · 17653 days ago · 33 km deep · 32 km away
  7. 4.2201 km WSW of Adak, Alaska · 17652 days ago · 33 km deep · 10 km away
  8. 4.5197 km WSW of Adak, Alaska · 17652 days ago · 33 km deep · 9 km away
  9. 5.9194 km W of Adak, Alaska · 17624 days ago · 33 km deep · 48 km away
  10. 4.6173 km WSW of Adak, Alaska · 17622 days ago · 66 km deep · 19 km away
  11. 4.9176 km WSW of Adak, Alaska · 17608 days ago · 67 km deep · 16 km away
  12. 4.4156 km WSW of Adak, Alaska · 17604 days ago · 56 km deep · 50 km away
  13. 3.9159 km WSW of Adak, Alaska · 17596 days ago · 68 km deep · 40 km away
  14. 4.9124 km WSW of Adak, Alaska · 17595 days ago · 54 km deep · 67 km away

Before

  1. 3.9173 km WSW of Adak, Alaska · 17653 days ago · 33 km deep · 23 km away
  2. 4.5185 km WSW of Adak, Alaska · 17653 days ago · 33 km deep · 12 km away
  3. 4.3176 km WSW of Adak, Alaska · 17653 days ago · 33 km deep · 42 km away
  4. 4.2196 km WSW of Adak, Alaska · 17653 days ago · 33 km deep · 7 km away
  5. 4.9194 km WSW of Adak, Alaska · 17653 days ago · 33 km deep · 9 km away
  6. 4.5206 km WSW of Adak, Alaska · 17653 days ago · 33 km deep · 15 km away
  7. 4.5199 km WSW of Adak, Alaska · 17653 days ago · 33 km deep · 34 km away
  8. 5.0187 km WSW of Adak, Alaska · 17653 days ago · 33 km deep · 10 km away
  9. 6.7192 km WSW of Adak, Alaska · 17653 days ago · 25 km deep · 4 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000uqd. Read Tue, Sep 22, 2026, 8:43 AM UTC.