Alaska earthquakes

M4.8 earthquake 201 km SE of Adak, Alaska

A magnitude 4.8 earthquake struck 201 km SE of Adak, Alaska on Thu, May 22, 1986, 7:18 AM HADT (16:18 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.4 125 km SE of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.8 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1986-05-22 16:18:00 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
50.394° N, 174.985° 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

Nearby

Within 100 km, magnitude 1.8 and up: 6 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 4.5104 km SE of Adak, Alaska · 14745 days ago · 33 km deep · 99 km away
  2. 4.8186 km S of Atka, Alaska · 14741 days ago · 33 km deep · 30 km away
  3. 4.3170 km SSW of Atka, Alaska · 14741 days ago · 33 km deep · 39 km away
  4. 4.5123 km S of Atka, Alaska · 14731 days ago · 33 km deep · 90 km away
  5. 5.4125 km SE of Adak, Alaska · 14715 days ago · 33 km deep · 92 km away
  6. 4.4135 km SE of Adak, Alaska · 14715 days ago · 33 km deep · 77 km away

Before

  1. 4.9110 km SSW of Atka, Alaska · 14748 days ago · 33 km deep · 98 km away
  2. 4.8106 km SE of Adak, Alaska · 14749 days ago · 33 km deep · 99 km away
  3. 4.5133 km SE of Adak, Alaska · 14750 days ago · 33 km deep · 75 km away
  4. 4.0122 km SSW of Atka, Alaska · 14752 days ago · 33 km deep · 97 km away
  5. 4.7116 km SSW of Atka, Alaska · 14757 days ago · 33 km deep · 91 km away
  6. 5.0111 km SE of Adak, Alaska · 14758 days ago · 33 km deep · 91 km away
  7. 4.3115 km SSW of Atka, Alaska · 14760 days ago · 33 km deep · 94 km away
  8. 4.7134 km SE of Adak, Alaska · 14760 days ago · 33 km deep · 69 km away
  9. 4.7113 km SSW of Atka, Alaska · 14760 days ago · 33 km deep · 94 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002uam. Read Sun, Oct 4, 2026, 9:37 PM UTC.