Alaska earthquakes

M3.9 earthquake 263 km WSW of Adak, Alaska

A magnitude 3.9 earthquake struck 263 km WSW of Adak, Alaska on Tue, Apr 17, 1973, 9:08 PM GMT+12 (09:08 UTC), 66 km (41 mi) below the surface.

A larger quake followed: M4.8 237 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
3.9 (mb), minor
Local time
UTC
1973-04-17 09:08:57 UTC
Depth
66.0 km (41.0 mi), shallow
Epicenter
51.459° N, 179.622° E
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
9

Nearby

Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 4.8237 km WSW of Adak, Alaska · 19511 days ago · 54 km deep · 52 km away
  2. 4.0248 km WSW of Adak, Alaska · 19511 days ago · 45 km deep · 65 km away
  3. 4.1248 km WSW of Adak, Alaska · 19511 days ago · 42 km deep · 57 km away
  4. 5.3207 km WSW of Adak, Alaska · 19493 days ago · 61 km deep · 60 km away
  5. 5.8222 km WSW of Adak, Alaska · 19477 days ago · 39 km deep · 45 km away
  6. 4.9221 km WSW of Adak, Alaska · 19477 days ago · 56 km deep · 53 km away
  7. 4.1239 km WSW of Adak, Alaska · 19475 days ago · 46 km deep · 46 km away
  8. 5.8201 km WSW of Adak, Alaska · 19457 days ago · 48 km deep · 71 km away
  9. 5.4204 km WSW of Adak, Alaska · 19457 days ago · 50 km deep · 70 km away

Before

  1. 3.8224 km W of Adak, Alaska · 19521 days ago · 111 km deep · 45 km away
  2. 4.2209 km WSW of Adak, Alaska · 19542 days ago · 51 km deep · 78 km away
  3. 4.9196 km WSW of Adak, Alaska · 19542 days ago · 40 km deep · 85 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00001ea. Read Tue, Sep 22, 2026, 3:49 PM UTC.