M6.2 earthquake 53 km ESE of Old Harbor, Alaska

A magnitude 6.2 earthquake struck 53 km ESE of Old Harbor, Alaska on Sat, Mar 28, 1964, 12:35 AM GMT-10 (10:35 UTC), 25 km (15 mi) below the surface.

A larger quake followed: M6.5 85 km SSE 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 2.5 and up: 24 in the 60 days after this one and 6 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event iscgem869892 (also filed as ushis2658). Read Tue, Sep 22, 2026, 6:57 AM UTC.