Alaska earthquakes

M2.3 earthquake 178 km S of Adak, Alaska

A magnitude 2.3 earthquake struck 178 km S of Adak, Alaska on Sun, Oct 31, 2021, 9:12 PM HADT (06:12 UTC), 20 km (12 mi) below the surface.

A larger quake followed: M3.3 188 km SSW of Adak, Alaska. This one was a foreshock.

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
2.3 (ml), micro
Local time
UTC
2021-11-01 06:12:59 UTC
Depth
19.8 km (12.3 mi), shallow
Epicenter
50.303° N, 177.137° 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
31

Nearby

Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 2.6217 km SSW of Adak, Alaska · 1782 days ago · 10 km deep · 82 km away
  2. 2.3238 km SSW of Adak, Alaska · 1772 days ago · 35 km deep · 88 km away
  3. 2.1130 km SW of Adak, Alaska · 1758 days ago · 26 km deep · 86 km away
  4. 3.3188 km SSW of Adak, Alaska · 1751 days ago · 31 km deep · 48 km away
  5. 3.1178 km SSW of Adak, Alaska · 1743 days ago · 10 km deep · 22 km away
  6. 3.2101 km SW of Adak, Alaska · 1741 days ago · 31 km deep · 99 km away
  7. 2.2171 km S of Adak, Alaska · 1738 days ago · 10 km deep · 64 km away
  8. 2.8161 km S of Adak, Alaska · 1733 days ago · 10 km deep · 67 km away

Before

  1. 3.2118 km SSW of Adak, Alaska · 1794 days ago · 33 km deep · 62 km away
  2. 3.5237 km SSW of Adak, Alaska · 1794 days ago · 10 km deep · 87 km away
  3. 2.8188 km S of Adak, Alaska · 1795 days ago · 10 km deep · 72 km away
  4. 1.8Andreanof Islands, Aleutian Islands, Alaska · 1807 days ago · 26 km deep · 80 km away
  5. 3.2157 km SW of Adak, Alaska · 1807 days ago · 33 km deep · 86 km away
  6. 3.7187 km S of Adak, Alaska · 1815 days ago · 10 km deep · 57 km away
  7. 1.6111 km SW of Adak, Alaska · 1815 days ago · 26 km deep · 98 km away
  8. 1.8112 km SW of Adak, Alaska · 1815 days ago · 18 km deep · 93 km away

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021e0ik5fe. Read Sat, Sep 26, 2026, 12:42 AM UTC.