M5.5 earthquake 94 km SSE of Old Harbor, Alaska
A magnitude 5.5 earthquake struck 94 km SSE of Old Harbor, Alaska on Sat, Apr 9, 1966, 10:08 AM GMT-10 (20:08 UTC), 22 km (14 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
- 5.5 (mw), moderate
- Local time
- UTC
- 1966-04-09 20:08:37 UTC
- Depth
- 22.2 km (13.8 mi), shallow
- Epicenter
- 56.475° N, 152.499° 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
- ±0.20
- Depth from
- From location
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.5 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.8103 km SE of Old Harbor, Alaska · 22085 days ago · 25 km deep · 21 km away
- 6.136 km ESE of Akhiok, Alaska · 22080 days ago · 35 km deep · 79 km away
- 5.436 km SSW of Chiniak, Alaska · 22074 days ago · 22 km deep · 91 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem848266. Read Mon, Sep 28, 2026, 11:21 AM UTC.