M4.7 earthquake 83 km S of Adak, Alaska
A magnitude 4.7 earthquake struck 83 km S of Adak, Alaska on Mon, Oct 10, 1977, 7:03 PM GMT-10 (05:03 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M6.7 52 km ESE 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
- 4.7 (mb), light
- Local time
- UTC
- 1977-10-11 05:03:11 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.137° N, 176.837° 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
- 64
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
- 6.752 km ESE of Adak, Alaska · 17854 days ago · 33 km deep · 84 km away
- 5.489 km SE of Adak, Alaska · 17854 days ago · 33 km deep · 95 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000qzu. Read Tue, Sep 22, 2026, 12:16 PM UTC.