Alaska earthquakes

M3.5 earthquake 237 km SSW of Adak, Alaska

A magnitude 3.5 earthquake struck 237 km SSW of Adak, Alaska on Wed, Oct 27, 2021, 10:11 PM HADT (07:11 UTC), 10 km (6 mi) below the surface.

More in Alaska

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude
3.5 (ml), minor
Local time
UTC
2021-10-28 07:11:43 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.011° N, 178.276° 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 4.4 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.10
Depth from
Operator assigned
Station coverage gap
244°, poorly surrounded by stations
Stations used
47

Nearby

Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 2.3178 km S of Adak, Alaska · 1789 days ago · 20 km deep · 87 km away
  2. 2.6217 km SSW of Adak, Alaska · 1782 days ago · 10 km deep · 23 km away
  3. 2.3238 km SSW of Adak, Alaska · 1771 days ago · 35 km deep · 1 km away
  4. 3.3188 km SSW of Adak, Alaska · 1750 days ago · 31 km deep · 50 km away
  5. 3.1178 km SSW of Adak, Alaska · 1742 days ago · 10 km deep · 71 km away

Before

  1. 3.2157 km SW of Adak, Alaska · 1807 days ago · 33 km deep · 87 km away
  2. 2.3179 km SSW of Adak, Alaska · 1822 days ago · 25 km deep · 58 km away

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000fph9 (also filed as ak021dtx0356). Read Fri, Sep 25, 2026, 3:56 PM UTC.