Alaska earthquakes

M5.1 earthquake 197 km WSW of Adak, Alaska

A magnitude 5.1 earthquake struck 197 km WSW of Adak, Alaska on Sat, Feb 22, 1975, 11:47 AM GMT-11 (22:47 UTC), 62 km (39 mi) below the surface.

A larger quake followed: M5.4 211 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
5.1 (mb), moderate
Local time
UTC
1975-02-22 22:47:45 UTC
Depth
62.0 km (38.5 mi), shallow
Epicenter
51.324° N, 179.337° 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
92

Nearby

Within 100 km, magnitude 2.1 and up: 9 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 5.0201 km WSW of Adak, Alaska · 18847 days ago · 55 km deep · 6 km away
  2. 5.0194 km WSW of Adak, Alaska · 18847 days ago · 50 km deep · 7 km away
  3. 4.4192 km W of Adak, Alaska · 18846 days ago · 59 km deep · 37 km away
  4. 4.7186 km WSW of Adak, Alaska · 18845 days ago · 59 km deep · 12 km away
  5. 4.3205 km WSW of Adak, Alaska · 18822 days ago · 63 km deep · 34 km away
  6. 4.9218 km WSW of Adak, Alaska · 18822 days ago · 53 km deep · 21 km away
  7. 5.4211 km WSW of Adak, Alaska · 18822 days ago · 57 km deep · 15 km away
  8. 4.1224 km WSW of Adak, Alaska · 18821 days ago · 56 km deep · 28 km away
  9. 4.9117 km WSW of Adak, Alaska · 18809 days ago · 62 km deep · 80 km away

Before

  1. 4.8205 km WSW of Adak, Alaska · 18847 days ago · 46 km deep · 14 km away
  2. 4.2213 km WSW of Adak, Alaska · 18847 days ago · 47 km deep · 20 km away
  3. 4.3211 km WSW of Adak, Alaska · 18848 days ago · 52 km deep · 16 km away
  4. 6.5200 km WSW of Adak, Alaska · 18848 days ago · 48 km deep · 8 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000a06. Read Wed, Sep 30, 2026, 2:52 AM UTC.