Alaska earthquakes

M4.6 earthquake 97 km SSW of Atka, Alaska

A magnitude 4.6 earthquake struck 97 km SSW of Atka, Alaska on Sun, Oct 19, 1986, 10:25 PM HADT (07:25 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.8 120 km SSW of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.6 (mb), light
Local time
UTC
1986-10-20 07:25:50 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.392° N, 174.748° 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 1.6 and up: 12 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 4.8120 km SSW of Atka, Alaska · 14582 days ago · 33 km deep · 25 km away
  2. 4.7102 km SSE of Adak, Alaska · 14578 days ago · 33 km deep · 88 km away
  3. 4.824 km SE of Atka, Alaska · 14575 days ago · 33 km deep · 94 km away
  4. 4.868 km SE of Adak, Alaska · 14572 days ago · 33 km deep · 76 km away
  5. 4.7174 km SSE of Adak, Alaska · 14565 days ago · 33 km deep · 99 km away
  6. 4.991 km SSW of Atka, Alaska · 14560 days ago · 33 km deep · 7 km away
  7. 4.6116 km S of Atka, Alaska · 14560 days ago · 33 km deep · 46 km away
  8. 5.589 km SSE of Atka, Alaska · 14557 days ago · 33 km deep · 64 km away
  9. 4.5103 km SSE of Adak, Alaska · 14552 days ago · 33 km deep · 96 km away
  10. 4.994 km S of Atka, Alaska · 14540 days ago · 33 km deep · 33 km away
  11. 5.290 km ESE of Adak, Alaska · 14525 days ago · 33 km deep · 52 km away
  12. 4.895 km SSW of Atka, Alaska · 14524 days ago · 33 km deep · 19 km away

Before

  1. 4.4136 km SE of Adak, Alaska · 14585 days ago · 33 km deep · 56 km away
  2. 5.690 km SW of Atka, Alaska · 14585 days ago · 33 km deep · 53 km away
  3. 4.767 km SE of Adak, Alaska · 14595 days ago · 33 km deep · 78 km away
  4. 4.579 km SE of Adak, Alaska · 14596 days ago · 33 km deep · 71 km away
  5. 4.977 km SSE of Adak, Alaska · 14598 days ago · 33 km deep · 97 km away
  6. 5.445 km ESE of Adak, Alaska · 14601 days ago · 33 km deep · 96 km away
  7. 5.0110 km SSW of Atka, Alaska · 14603 days ago · 33 km deep · 17 km away
  8. 4.199 km SW of Atka, Alaska · 14604 days ago · 33 km deep · 33 km away
  9. 4.1108 km SE of Adak, Alaska · 14605 days ago · 33 km deep · 46 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002z3k. Read Tue, Sep 22, 2026, 5:15 PM UTC.