Alaska earthquakes

M6.6 earthquake 94 km SSE of Old Harbor, Alaska

A magnitude 6.6 earthquake struck 94 km SSE of Old Harbor, Alaska on Tue, Apr 11, 1978, 5:42 PM GMT-10 (03:42 UTC), 14 km (9 mi) below the surface.

Womens Bay forecast More in Alaska

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The earthquake

Magnitude: 6.6 (ms), strong
Local time: Tue, Apr 11, 1978, 5:42 PM GMT-10
UTC: 1978-04-12 03:42:03 UTC
Depth: 14.0 km (8.7 mi), shallow
Epicenter: 56.423° N, 152.691° 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.

Stations used: 320

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 2.5 and up: 16 in the 60 days after this one and 0 in the 30 days before it.

After

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000u1x (also filed as gcmtc041278a, ushis3472, gcmt19780412034203, iscgem683645). Read Tue, Sep 22, 2026, 8:28 PM UTC.