Alaska earthquakes

M4.9 earthquake 86 km S of Atka, Alaska

A magnitude 4.9 earthquake struck 86 km S of Atka, Alaska on Fri, Aug 1, 1986, 12:48 PM HADT (21:48 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.0 87 km S of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.9 (mb), light
Local time
UTC
1986-08-01 21:48:40 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.416° N, 174.212° 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 1.9 and up: 9 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 4.571 km S of Atka, Alaska · 14667 days ago · 33 km deep · 16 km away
  2. 4.795 km SSW of Atka, Alaska · 14666 days ago · 33 km deep · 38 km away
  3. 5.087 km S of Atka, Alaska · 14665 days ago · 33 km deep · 4 km away
  4. 4.3Andreanof Islands, Aleutian Islands, Alaska · 14659 days ago · 33 km deep · 38 km away
  5. 4.888 km SW of Atka, Alaska · 14654 days ago · 33 km deep · 73 km away
  6. 4.488 km SW of Atka, Alaska · 14636 days ago · 33 km deep · 72 km away
  7. 4.1108 km SE of Adak, Alaska · 14610 days ago · 33 km deep · 83 km away
  8. 4.199 km SW of Atka, Alaska · 14609 days ago · 33 km deep · 68 km away
  9. 5.0110 km SSW of Atka, Alaska · 14608 days ago · 33 km deep · 53 km away

Before

  1. 4.889 km S of Atka, Alaska · 14667 days ago · 33 km deep · 4 km away
  2. 5.492 km S of Atka, Alaska · 14667 days ago · 33 km deep · 7 km away
  3. 4.4Andreanof Islands, Aleutian Islands, Alaska · 14670 days ago · 33 km deep · 82 km away
  4. 4.785 km SW of Atka, Alaska · 14671 days ago · 33 km deep · 78 km away
  5. 5.588 km WSW of Atka, Alaska · 14671 days ago · 33 km deep · 85 km away
  6. 5.4Andreanof Islands, Aleutian Islands, Alaska · 14671 days ago · 33 km deep · 22 km away
  7. 4.993 km SW of Atka, Alaska · 14675 days ago · 33 km deep · 77 km away
  8. 4.631 km SW of Atka, Alaska · 14679 days ago · 33 km deep · 72 km away
  9. 4.0101 km SW of Atka, Alaska · 14680 days ago · 33 km deep · 66 km away
  10. 4.888 km SSW of Atka, Alaska · 14682 days ago · 33 km deep · 26 km away
  11. 4.5Andreanof Islands, Aleutian Islands, Alaska · 14690 days ago · 33 km deep · 65 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002wt4. Read Sun, Sep 27, 2026, 12:49 PM UTC.