M5.6 earthquake 78 km SE of Atka, Alaska
A magnitude 5.6 earthquake struck 78 km SE of Atka, Alaska on Tue, Jul 19, 1966, 8:20 AM GMT-11 (19:20 UTC), 32 km (20 mi) below the surface.
A larger quake followed: M5.8 82 km SSE of Atka, 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, moment), moderate
- Magnitude from
- ISC-GEM global catalog
- Local time
- UTC
- 1966-07-19 19:20:33 UTC
- Depth
- 31.8 km (19.8 mi), shallow
- Epicenter
- 51.661° N, 173.447° 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
- ±0.23
- Depth from
- From location
Nearby
Within 100 km, magnitude 2.6 and up: 2 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 iscgem845645. Read Fri, Oct 2, 2026, 3:05 PM UTC.