M5.6 earthquake 212 km WSW of Adak, Alaska
A magnitude 5.6 earthquake struck 212 km WSW of Adak, Alaska on Mon, Aug 4, 1969, 12:23 AM GMT-10 (10:23 UTC), 44 km (27 mi) below the surface.
A larger quake followed: M6.7 194 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
- 1969-08-04 10:23:31 UTC
- Depth
- 44.1 km (27.4 mi), shallow
- Epicenter
- 51.300° N, 179.555° 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
Nearby
Within 100 km, magnitude 2.5 and up: 3 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 iscgem805191. Read Tue, Sep 22, 2026, 3:09 PM UTC.