Alaska earthquakes

M4.0 earthquake 104 km SE of Atka, Alaska

A magnitude 4.0 earthquake struck 104 km SE of Atka, Alaska on Thu, Feb 21, 2019, 7:17 AM HAST (17:17 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.2 188 km SE of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.0 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2019-02-21 17:17:37 UTC
Depth
33.4 km (20.8 mi), shallow
Epicenter
51.464° N, 173.245° 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 14.6 km horizontally, 9.2 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
223°, poorly surrounded by stations
Stations used
32

Nearby

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 4.1194 km SE of Atka, Alaska · 2778 days ago · 10 km deep · 90 km away
  2. 3.7191 km SE of Atka, Alaska · 2775 days ago · 10 km deep · 86 km away
  3. 3.478 km SE of Atka, Alaska · 2770 days ago · 35 km deep · 28 km away
  4. 2.358 km SSW of Atka, Alaska · 2769 days ago · 19 km deep · 84 km away
  5. 4.2188 km SE of Atka, Alaska · 2756 days ago · 16 km deep · 84 km away
  6. 4.084 km SE of Atka, Alaska · 2756 days ago · 53 km deep · 35 km away
  7. 3.2123 km S of Atka, Alaska · 2748 days ago · 10 km deep · 70 km away
  8. 3.372 km SE of Atka, Alaska · 2744 days ago · 27 km deep · 36 km away
  9. 3.088 km SE of Atka, Alaska · 2729 days ago · 38 km deep · 27 km away
  10. 2.885 km ESE of Atka, Alaska · 2724 days ago · 33 km deep · 36 km away
  11. 3.174 km ESE of Atka, Alaska · 2720 days ago · 27 km deep · 48 km away

Before

  1. 4.573 km SE of Atka, Alaska · 2779 days ago · 45 km deep · 40 km away
  2. 2.050 km S of Atka, Alaska · 2783 days ago · 0 km deep · 67 km away
  3. 3.164 km SE of Atka, Alaska · 2785 days ago · 35 km deep · 41 km away
  4. 4.137 km S of Atka, Alaska · 2786 days ago · 67 km deep · 74 km away
  5. 4.125 km SSW of Atka, Alaska · 2788 days ago · 4 km deep · 98 km away
  6. 2.796 km S of Atka, Alaska · 2799 days ago · 35 km deep · 80 km away
  7. 2.6192 km SSE of Atka, Alaska · 2807 days ago · 10 km deep · 94 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000j9ft. Read Thu, Oct 1, 2026, 3:13 PM UTC.