M5.6 earthquake 210 km WSW of Adak, Alaska
A magnitude 5.6 earthquake struck 210 km WSW of Adak, Alaska on Tue, Dec 31, 1968, 10:07 PM GMT-11 (09:07 UTC), 45 km (28 mi) below the surface.
A larger quake followed: M5.9 203 km WSW of Adak, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.6 (mw), moderate
- Local time
- UTC
- 1969-01-01 09:07:06 UTC
- Depth
- 45.0 km (28.0 mi), shallow
- Epicenter
- 51.096° N, 179.392° 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
- ±0.32
- Depth from
- From location
Nearby
Within 100 km, magnitude 2.6 and up: 1 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem812771. Read Tue, Sep 29, 2026, 7:03 AM UTC.