M4.0 earthquake 189 km S of Adak, Alaska
A magnitude 4.0 earthquake struck 189 km S of Adak, Alaska on Tue, Dec 29, 2020, 5:17 PM HAST (03:17 UTC), 10 km (6 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.0 (mb), light
- Local time
- UTC
- 2020-12-30 03:17:52 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 50.171° N, 176.820° 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.
- Location uncertainty
- About 4.6 km horizontally, 1.9 km in depth
- Magnitude uncertainty
- ±0.11
- Depth from
- Operator assigned
- Station coverage gap
- 142°
- Stations used
- 67
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 3 in the 30 days before it.
After
- 2.6177 km SSW of Adak, Alaska · 2085 days ago · 10 km deep · 41 km away
- 3.7180 km SSE of Adak, Alaska · 2077 days ago · 10 km deep · 93 km away
- 2.8193 km S of Adak, Alaska · 2062 days ago · 10 km deep · 7 km away
- 2.8178 km S of Adak, Alaska · 2044 days ago · 28 km deep · 17 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000d6rn (also filed as ak020grp1tya). Read Sat, Sep 26, 2026, 2:11 PM UTC.