Alaska earthquakes

M4.1 earthquake 29 km S of Adak, Alaska

A magnitude 4.1 earthquake struck 29 km S of Adak, Alaska on Sun, Apr 20, 1997, 3:18 AM HADT (12:18 UTC), 64 km (39 mi) below the surface.

A larger quake followed: M4.8 52 km S of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.1 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1997-04-20 12:18:45 UTC
Depth
63.5 km (39.5 mi), shallow
Epicenter
51.614° N, 176.702° 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
FROM_LOCATION

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 3.259 km S of Adak, Alaska · 10754 days ago · 33 km deep · 31 km away
  2. 4.796 km SSW of Adak, Alaska · 10746 days ago · 33 km deep · 69 km away
  3. 4.6106 km SSW of Adak, Alaska · 10746 days ago · 33 km deep · 78 km away
  4. 3.8111 km S of Adak, Alaska · 10724 days ago · 33 km deep · 82 km away
  5. 4.088 km S of Adak, Alaska · 10724 days ago · 33 km deep · 59 km away
  6. 4.852 km S of Adak, Alaska · 10724 days ago · 44 km deep · 24 km away
  7. 4.324 km ENE of Adak, Alaska · 10721 days ago · 72 km deep · 48 km away
  8. 4.089 km S of Adak, Alaska · 10718 days ago · 33 km deep · 62 km away
  9. 3.939 km ENE of Adak, Alaska · 10718 days ago · 33 km deep · 61 km away
  10. 3.575 km ESE of Adak, Alaska · 10706 days ago · 33 km deep · 70 km away

Before

  1. 2.844 km E of Adak, Alaska · 10759 days ago · 33 km deep · 55 km away
  2. 4.348 km SSE of Adak, Alaska · 10761 days ago · 33 km deep · 30 km away
  3. 5.5115 km WSW of Adak, Alaska · 10777 days ago · 33 km deep · 100 km away
  4. 4.8112 km WSW of Adak, Alaska · 10782 days ago · 33 km deep · 97 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00080v1. Read Thu, Oct 1, 2026, 8:10 PM UTC.