Alaska earthquakes

M5.2 earthquake 138 km S of Unalaska, Alaska

A magnitude 5.2 earthquake struck 138 km S of Unalaska, Alaska on Sun, Sep 12, 1982, 2:59 AM GMT-9 (11:59 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.5 122 km SSW of Unalaska, Alaska. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
5.2 (mb), moderate
Local time
UTC
1982-09-12 11:59:52 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
52.642° N, 166.848° 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
OPERATOR_ASSIGNED

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 2.2 and up: 10 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 4.5148 km ESE of Nikolski, Alaska · 16082 days ago · 33 km deep · 17 km away
  2. 5.5122 km SSW of Unalaska, Alaska · 16082 days ago · 33 km deep · 24 km away
  3. 4.6151 km ESE of Nikolski, Alaska · 16082 days ago · 33 km deep · 24 km away
  4. 4.6155 km ESE of Nikolski, Alaska · 16082 days ago · 33 km deep · 30 km away
  5. 4.8136 km ESE of Nikolski, Alaska · 16082 days ago · 33 km deep · 8 km away
  6. 4.7129 km SSW of Unalaska, Alaska · 16081 days ago · 33 km deep · 11 km away
  7. 5.0107 km SSW of Unalaska, Alaska · 16079 days ago · 33 km deep · 37 km away
  8. 4.7Fox Islands, Aleutian Islands, Alaska · 16076 days ago · 33 km deep · 71 km away
  9. 4.8133 km ESE of Nikolski, Alaska · 16075 days ago · 33 km deep · 7 km away
  10. 4.5123 km SSW of Unalaska, Alaska · 16074 days ago · 33 km deep · 19 km away

Before

  1. 4.7157 km ESE of Nikolski, Alaska · 16083 days ago · 33 km deep · 37 km away
  2. 4.5152 km ESE of Nikolski, Alaska · 16083 days ago · 33 km deep · 27 km away
  3. 4.7120 km SSW of Unalaska, Alaska · 16083 days ago · 33 km deep · 23 km away
  4. 4.8162 km ESE of Nikolski, Alaska · 16083 days ago · 33 km deep · 39 km away
  5. 5.1102 km SSW of Unalaska, Alaska · 16083 days ago · 33 km deep · 45 km away
  6. 4.8134 km S of Unalaska, Alaska · 16083 days ago · 33 km deep · 5 km away
  7. 5.9133 km ESE of Nikolski, Alaska · 16083 days ago · 33 km deep · 6 km away
  8. 4.8136 km ESE of Nikolski, Alaska · 16092 days ago · 33 km deep · 10 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0001pjd (also filed as iscgemsup591920). Read Wed, Sep 23, 2026, 10:01 PM UTC.