Alaska earthquakes

M2.8 earthquake 275 km SW of Adak, Alaska

A magnitude 2.8 earthquake struck 275 km SW of Adak, Alaska on Mon, Dec 14, 2020, 8:27 PM GMT-12 (08:27 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M3.9 251 km SW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
2.8 (ml), micro
Local time
UTC
2020-12-15 08:27:55 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
50.044° N, 179.279° 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 6.5 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.15
Depth from
Operator assigned
Station coverage gap
315°, poorly surrounded by stations
Stations used
19

Nearby

Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 3.9251 km SW of Adak, Alaska · 2103 days ago · 10 km deep · 28 km away
  2. 2.5273 km SW of Adak, Alaska · 2098 days ago · 27 km deep · 63 km away
  3. 2.6247 km WSW of Adak, Alaska · 2091 days ago · 10 km deep · 95 km away
  4. 3.4267 km SW of Adak, Alaska · 2089 days ago · 21 km deep · 8 km away
  5. 2.8270 km SW of Adak, Alaska · 2088 days ago · 10 km deep · 11 km away

Before

  1. 4.5221 km WSW of Adak, Alaska · 2118 days ago · 10 km deep · 92 km away
  2. 2.7206 km WSW of Adak, Alaska · 2126 days ago · 6 km deep · 93 km away
  3. 3.3Rat Islands, Aleutian Islands, Alaska · 2127 days ago · 10 km deep · 78 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000csx6 (also filed as ak020g2z0uav). Read Mon, Sep 28, 2026, 5:25 PM UTC.