M5.5 earthquake 181 km E of Atka, Alaska
A magnitude 5.5 earthquake struck 181 km E of Atka, Alaska on Wed, Nov 23, 1977, 5:55 AM GMT-11 (16:55 UTC), 53 km (33 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.5 (ms), moderate
- Local time
- UTC
- 1977-11-23 16:55:20 UTC
- Depth
- 53.0 km (32.9 mi), shallow
- Epicenter
- 52.195° N, 171.546° 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.
- Stations used
- 249
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
- 5.1115 km SW of Nikolski, Alaska · 17811 days ago · 44 km deep · 99 km away
- 4.897 km ESE of Atka, Alaska · 17798 days ago · 33 km deep · 94 km away
- 4.6131 km SW of Nikolski, Alaska · 17779 days ago · 33 km deep · 82 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000rps (also filed as gcmtb112377b, ushis3459, gcmt19771123165520, iscgem690779). Read Tue, Sep 22, 2026, 7:32 AM UTC.