Alaska earthquakes

M3.5 earthquake 172 km SSE of Old Harbor, Alaska

A magnitude 3.5 earthquake struck 172 km SSE of Old Harbor, Alaska on Wed, Apr 12, 1978, 12:40 AM GMT-10 (10:40 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.7 Kodiak Island region, Alaska. This one was a foreshock.

Womens Bay forecast More in Alaska

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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: 3.5 (ML, local (Richter)), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Wed, Apr 12, 1978, 12:40 AM GMT-10
UTC: 1978-04-12 10:40:43 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 55.865° N, 151.900° 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
Stations used: 20

Nearest places

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

Womens Bay, AlaskaPopulation 719. Forecast207 kmSSE

Nearby

Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 7 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000u27. Read Thu, Oct 1, 2026, 3:02 PM UTC.