Alaska earthquakes

M4.5 earthquake 94 km SSW of Adak, Alaska

A magnitude 4.5 earthquake struck 94 km SSW of Adak, Alaska on Wed, Sep 17, 1986, 4:54 PM HADT (01:54 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.9 45 km S of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.5 (mb), light
Local time
UTC
1986-09-18 01:54:18 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.046° N, 176.960° 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 1.5 and up: 10 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 4.977 km SSE of Adak, Alaska · 14605 days ago · 33 km deep · 62 km away
  2. 4.579 km SE of Adak, Alaska · 14603 days ago · 33 km deep · 92 km away
  3. 4.767 km SE of Adak, Alaska · 14602 days ago · 33 km deep · 93 km away
  4. 4.4178 km S of Adak, Alaska · 14602 days ago · 33 km deep · 95 km away
  5. 5.254 km SSW of Adak, Alaska · 14585 days ago · 33 km deep · 40 km away
  6. 4.7102 km SSE of Adak, Alaska · 14585 days ago · 33 km deep · 74 km away
  7. 4.868 km SE of Adak, Alaska · 14579 days ago · 33 km deep · 95 km away
  8. 5.945 km S of Adak, Alaska · 14572 days ago · 33 km deep · 51 km away
  9. 4.864 km SSE of Adak, Alaska · 14572 days ago · 33 km deep · 46 km away
  10. 4.792 km S of Adak, Alaska · 14569 days ago · 33 km deep · 40 km away

Before

  1. 4.946 km SW of Adak, Alaska · 14625 days ago · 33 km deep · 58 km away
  2. 5.0128 km WSW of Adak, Alaska · 14636 days ago · 33 km deep · 99 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002y6e. Read Tue, Sep 29, 2026, 6:46 PM UTC.