Alaska earthquakes

M5.5 earthquake 27 km E of Adak, Alaska

A magnitude 5.5 earthquake struck 27 km E of Adak, Alaska on Wed, Jul 9, 1986, 8:10 AM HADT (17:10 UTC), 50 km (31 mi) below the surface.

A larger quake followed: M5.8 76 km SSE of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 5.5 (mw), moderate
Local time: Wed, Jul 9, 1986, 8:10 AM HADT
UTC: 1986-07-09 17:10:22 UTC
Depth: 49.7 km (30.9 mi), shallow
Epicenter: 51.907° N, 176.239° 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: CONSTRAINED_BY_DEPTH_PHASES

Nearby

Within 100 km, magnitude 2.5 and up: 28 in the 60 days after this one and 32 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002vvr (also filed as gcmtb070986a, gcmt19860709171023, iscgem490375). Read Wed, Sep 23, 2026, 3:22 AM UTC.