M4.3 earthquake 85 km SSE of Adak, Alaska
A magnitude 4.3 earthquake struck 85 km SSE of Adak, Alaska on Sun, Mar 27, 1977, 4:28 PM GMT-11 (03:28 UTC), 33 km (21 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.3 (mb), light
- Local time
- UTC
- 1977-03-28 03:28:35 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.215° N, 176.010° 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.
- Depth from
- OPERATOR_ASSIGNED
- Stations used
- 8
Nearby
Within 100 km, magnitude 1.5 and up: 0 in the 60 days after this one and 1 in the 30 days before it.
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000n5f. Read Tue, Sep 22, 2026, 7:28 AM UTC.