Alaska earthquakes

M2.5 earthquake 176 km SSE of Adak, Alaska

A magnitude 2.5 earthquake struck 176 km SSE of Adak, Alaska on Wed, Apr 21, 2021, 6:26 AM HADT (15:26 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.7 174 km SE 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
2.5 (ml), micro
Local time
UTC
2021-04-21 15:26:01 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.528° N, 175.293° 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 4.8 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.13
Depth from
Operator assigned
Station coverage gap
254°, poorly surrounded by stations
Stations used
15

Nearby

Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 13 in the 30 days before it.

After

  1. 1.8119 km SSW of Atka, Alaska · 1976 days ago · 7 km deep · 83 km away
  2. 3.7174 km SE of Adak, Alaska · 1950 days ago · 10 km deep · 24 km away
  3. 2.2170 km S of Adak, Alaska · 1943 days ago · 12 km deep · 71 km away
  4. 2.6163 km S of Atka, Alaska · 1938 days ago · 27 km deep · 77 km away
  5. 1.9105 km SSW of Atka, Alaska · 1925 days ago · 64 km deep · 99 km away

Before

  1. 1.9121 km SSW of Atka, Alaska · 1985 days ago · 8 km deep · 79 km away
  2. 3.898 km SSE of Adak, Alaska · 1987 days ago · 10 km deep · 78 km away
  3. 2.0124 km S of Atka, Alaska · 1987 days ago · 18 km deep · 91 km away
  4. 2.7121 km S of Atka, Alaska · 1996 days ago · 10 km deep · 94 km away
  5. 2.0162 km SE of Adak, Alaska · 1996 days ago · 20 km deep · 24 km away
  6. 2.7204 km S of Atka, Alaska · 1998 days ago · 10 km deep · 64 km away
  7. 1.9123 km SSW of Atka, Alaska · 2004 days ago · 16 km deep · 80 km away
  8. 2.9Andreanof Islands, Aleutian Islands, Alaska · 2005 days ago · 16 km deep · 70 km away
  9. 2.6127 km SSW of Atka, Alaska · 2005 days ago · 27 km deep · 74 km away
  10. 3.7131 km SSW of Atka, Alaska · 2005 days ago · 24 km deep · 69 km away
  11. 2.1Andreanof Islands, Aleutian Islands, Alaska · 2006 days ago · 15 km deep · 93 km away
  12. 2.3182 km SE of Adak, Alaska · 2009 days ago · 2 km deep · 21 km away
  13. 2.3101 km SE of Adak, Alaska · 2011 days ago · 4 km deep · 87 km away

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000e37m. Read Fri, Sep 25, 2026, 5:56 PM UTC.