M2.8 earthquake 178 km S of Adak, Alaska
A magnitude 2.8 earthquake struck 178 km S of Adak, Alaska on Sat, Feb 20, 2021, 7:53 AM HAST (17:53 UTC), 28 km (18 mi) below the surface.
A larger quake followed: M3.3 181 km SSW 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
- 2.8 (ml), micro
- Local time
- UTC
- 2021-02-20 17:53:13 UTC
- Depth
- 28.4 km (17.7 mi), shallow
- Epicenter
- 50.281° N, 176.993° 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 3.8 km horizontally, 10.8 km in depth
- Magnitude uncertainty
- ±0.15
- Depth from
- From location
- Station coverage gap
- 277°, poorly surrounded by stations
- Stations used
- 32
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 3 in the 30 days before it.
After
- 3.3181 km SSW of Adak, Alaska · 2036 days ago · 10 km deep · 19 km away
- 2.5165 km SSE of Adak, Alaska · 2026 days ago · 10 km deep · 65 km away
- 2.1107 km SSW of Adak, Alaska · 1999 days ago · 26 km deep · 73 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000djqk (also filed as ak0212cmuhlp). Read Sat, Sep 26, 2026, 12:54 PM UTC.