Alaska earthquakes

M4.9 earthquake 46 km SW of Adak, Alaska

A magnitude 4.9 earthquake struck 46 km SW of Adak, Alaska on Sun, Sep 14, 1986, 9:29 PM HADT (06:29 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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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
4.9 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1986-09-15 06:29:35 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.561° N, 177.085° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

What happened

The USGS’s account of the effects of this earthquake.

Felt on Adak.

From the USGS event page for usp0002y3h. U.S. Geological Survey text and figures are in the public domain.

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: 12 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 4.594 km SSW of Adak, Alaska · 14625 days ago · 33 km deep · 58 km away
  2. 5.445 km ESE of Adak, Alaska · 14612 days ago · 33 km deep · 78 km away
  3. 4.977 km SSE of Adak, Alaska · 14608 days ago · 33 km deep · 75 km away
  4. 5.225 km E of Adak, Alaska · 14607 days ago · 43 km deep · 66 km away
  5. 4.579 km SE of Adak, Alaska · 14607 days ago · 33 km deep · 93 km away
  6. 4.767 km SE of Adak, Alaska · 14606 days ago · 33 km deep · 86 km away
  7. 5.254 km SSW of Adak, Alaska · 14589 days ago · 33 km deep · 24 km away
  8. 4.7102 km SSE of Adak, Alaska · 14588 days ago · 33 km deep · 98 km away
  9. 4.868 km SE of Adak, Alaska · 14582 days ago · 33 km deep · 87 km away
  10. 5.945 km S of Adak, Alaska · 14575 days ago · 33 km deep · 30 km away
  11. 4.864 km SSE of Adak, Alaska · 14575 days ago · 33 km deep · 53 km away
  12. 4.792 km S of Adak, Alaska · 14572 days ago · 33 km deep · 74 km away

Before

  1. 5.0128 km WSW of Adak, Alaska · 14640 days ago · 33 km deep · 87 km away
  2. 4.364 km ESE of Adak, Alaska · 14653 days ago · 33 km deep · 94 km away
  3. 4.237 km E of Adak, Alaska · 14655 days ago · 33 km deep · 75 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002y3h. Read Sat, Oct 3, 2026, 3:32 AM UTC.