M4.6 earthquake 61 km SSE of Adak, Alaska
A magnitude 4.6 earthquake struck 61 km SSE of Adak, Alaska on Mon, Dec 19, 1977, 9:31 AM GMT-11 (20:31 UTC), 54 km (34 mi) below the surface.
A larger quake followed: M5.3 44 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
- 4.6 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1977-12-19 20:31:22 UTC
- Depth
- 54.0 km (33.6 mi), shallow
- Epicenter
- 51.343° N, 176.374° 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
- 14
Nearby
Within 100 km, magnitude 1.6 and up: 4 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.065 km S of Adak, Alaska · 17819 days ago · 56 km deep · 13 km away
- 4.166 km SSE of Adak, Alaska · 17819 days ago · 53 km deep · 6 km away
- 5.344 km ESE of Adak, Alaska · 17802 days ago · 63 km deep · 54 km away
- 3.947 km SW of Adak, Alaska · 17798 days ago · 121 km deep · 63 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000s56. Read Fri, Oct 2, 2026, 8:37 PM UTC.