M3.8 earthquake 98 km ESE of Old Harbor, Alaska

A magnitude 3.8 earthquake struck 98 km ESE of Old Harbor, Alaska on Wed, Jul 31, 1974, 9:14 PM GMT-9 (06:14 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M6.0 89 km SE of Old Harbor, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 25 in the 60 days after this one and 4 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event usp00007e5. Read Tue, Sep 29, 2026, 5:23 PM UTC.