Alaska earthquakes

M4.1 earthquake 224 km WSW of Adak, Alaska

A magnitude 4.1 earthquake struck 224 km WSW of Adak, Alaska on Fri, Mar 21, 1975, 3:16 AM GMT-10 (13:16 UTC), 56 km (35 mi) below the surface.

A larger quake followed: M5.2 258 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.1 (mb), light
Local time
UTC
1975-03-21 13:16:07 UTC
Depth
56.0 km (34.8 mi), shallow
Epicenter
51.201° N, 179.680° 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
11

Nearby

Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 5.2258 km WSW of Adak, Alaska · 18773 days ago · 48 km deep · 48 km away
  2. 4.2161 km SW of Adak, Alaska · 18766 days ago · 33 km deep · 90 km away

Before

  1. 5.4211 km WSW of Adak, Alaska · 18814 days ago · 57 km deep · 16 km away
  2. 4.9218 km WSW of Adak, Alaska · 18814 days ago · 53 km deep · 8 km away
  3. 4.3205 km WSW of Adak, Alaska · 18815 days ago · 63 km deep · 36 km away
  4. 4.7186 km WSW of Adak, Alaska · 18838 days ago · 59 km deep · 39 km away
  5. 4.4192 km W of Adak, Alaska · 18838 days ago · 59 km deep · 54 km away
  6. 5.0194 km WSW of Adak, Alaska · 18839 days ago · 50 km deep · 29 km away
  7. 5.0201 km WSW of Adak, Alaska · 18839 days ago · 55 km deep · 24 km away
  8. 5.1197 km WSW of Adak, Alaska · 18840 days ago · 62 km deep · 28 km away
  9. 4.8205 km WSW of Adak, Alaska · 18840 days ago · 46 km deep · 25 km away
  10. 4.2213 km WSW of Adak, Alaska · 18840 days ago · 47 km deep · 13 km away
  11. 4.3211 km WSW of Adak, Alaska · 18840 days ago · 52 km deep · 15 km away
  12. 6.5200 km WSW of Adak, Alaska · 18840 days ago · 48 km deep · 27 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000ab1. Read Tue, Sep 22, 2026, 10:49 AM UTC.