M5.8 earthquake 103 km SE of Old Harbor, Alaska
A magnitude 5.8 earthquake struck 103 km SE of Old Harbor, Alaska on Mon, Apr 11, 1966, 1:00 PM GMT-10 (23:00 UTC), 25 km (16 mi) below the surface.
A larger quake followed: M6.1 36 km ESE of Akhiok, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.8 (mw), moderate
- Local time
- UTC
- 1966-04-11 23:00:24 UTC
- Depth
- 25.0 km (15.5 mi), shallow
- Epicenter
- 56.516° N, 152.173° 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.
- Magnitude uncertainty
- ±0.33
- Depth from
- From location
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.8 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 6.136 km ESE of Akhiok, Alaska · 22080 days ago · 35 km deep · 95 km away
- 5.436 km SSW of Chiniak, Alaska · 22073 days ago · 22 km deep · 88 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem848322 (also filed as ushis2888). Read Sun, Sep 27, 2026, 10:30 PM UTC.