Alaska earthquakes

M5.9 earthquake 86 km SSW of Adak, Alaska

A magnitude 5.9 earthquake struck 86 km SSW of Adak, Alaska on Sat, Feb 6, 1971, 3:42 PM GMT-11 (02:42 UTC), 25 km (16 mi) below the surface.

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The earthquake

Magnitude
5.9 (mw), moderate
Local time
UTC
1971-02-07 02:42:03 UTC
Depth
25.0 km (15.5 mi), shallow
Epicenter
51.145° N, 177.086° 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.

Magnitude uncertainty
±0.20
Depth from
From location

Nearby

Within 100 km, magnitude 2.9 and up: 4 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 5.682 km SSW of Adak, Alaska · 20321 days ago · 25 km deep · 8 km away
  2. 5.5103 km SSW of Adak, Alaska · 20321 days ago · 35 km deep · 17 km away
  3. 5.590 km SSW of Adak, Alaska · 20317 days ago · 35 km deep · 3 km away
  4. 5.895 km SSW of Adak, Alaska · 20270 days ago · 25 km deep · 21 km away

Before

  1. 6.961 km SSW of Adak, Alaska · 20321 days ago · 30 km deep · 27 km away
  2. 6.492 km WSW of Adak, Alaska · 20334 days ago · 40 km deep · 59 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event iscgem786955 (also filed as ushis3132). Read Sun, Sep 27, 2026, 8:29 AM UTC.