M4.7 earthquake 81 km SSE of Chiniak, Alaska
A magnitude 4.7 earthquake struck 81 km SSE of Chiniak, Alaska on Fri, Aug 26, 1977, 6:51 PM GMT-9 (03:51 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.9 79 km SE of Old Harbor, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.7 (mb), light
- Local time
- UTC
- 1977-08-27 03:51:50 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 56.945° N, 151.718° 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
- 28
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.7 and up: 2 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.979 km SE of Old Harbor, Alaska · 17919 days ago · 20 km deep · 60 km away
- 4.880 km SE of Old Harbor, Alaska · 17898 days ago · 20 km deep · 54 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000qbj. Read Tue, Sep 22, 2026, 7:01 AM UTC.