Alaska earthquakes

M3.9 earthquake 190 km S of Atka, Alaska

A magnitude 3.9 earthquake struck 190 km S of Atka, Alaska on Sun, Aug 4, 2019, 4:05 AM HADT (13:05 UTC), 10 km (6 mi) below the surface.

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

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The earthquake

Magnitude
3.9 (mb, body-wave), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2019-08-04 13:05:05 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.491° N, 174.471° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.ScaleComputed byNotes
3.9mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.132 · 19 stations
3.1ML, local (Richter)Alaska Earthquake CenterPreliminary

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, 1.9 km in depth
Magnitude uncertainty
±0.13
Depth from
Operator assigned
Station coverage gap
138°
Stations used
45

Nearby

Within 100 km, magnitude 1.5 and up: 13 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 2.0119 km SSW of Atka, Alaska · 2610 days ago · 18 km deep · 94 km away
  2. 2.1120 km SSW of Atka, Alaska · 2610 days ago · 39 km deep · 94 km away
  3. 2.5202 km SSE of Adak, Alaska · 2609 days ago · 10 km deep · 53 km away
  4. 2.6103 km SSW of Atka, Alaska · 2607 days ago · 10 km deep · 88 km away
  5. 2.1166 km S of Atka, Alaska · 2607 days ago · 23 km deep · 33 km away
  6. 2.2172 km SSE of Atka, Alaska · 2606 days ago · 0 km deep · 100 km away
  7. 1.897 km S of Atka, Alaska · 2606 days ago · 66 km deep · 93 km away
  8. 2.1196 km S of Atka, Alaska · 2594 days ago · 10 km deep · 19 km away
  9. 2.1125 km S of Atka, Alaska · 2585 days ago · 5 km deep · 72 km away
  10. 3.1145 km S of Atka, Alaska · 2582 days ago · 10 km deep · 61 km away
  11. 2.4Andreanof Islands, Aleutian Islands, Alaska · 2567 days ago · 12 km deep · 99 km away
  12. 2.6174 km S of Atka, Alaska · 2562 days ago · 10 km deep · 20 km away
  13. 2.5209 km SSE of Adak, Alaska · 2558 days ago · 10 km deep · 45 km away

Before

  1. 1.9133 km S of Atka, Alaska · 2623 days ago · 15 km deep · 63 km away
  2. 2.0109 km SSW of Atka, Alaska · 2623 days ago · 17 km deep · 92 km away
  3. 2.9109 km SSW of Atka, Alaska · 2624 days ago · 28 km deep · 90 km away
  4. 4.4106 km SSW of Atka, Alaska · 2624 days ago · 26 km deep · 100 km away
  5. 1.9124 km SSW of Atka, Alaska · 2629 days ago · 25 km deep · 89 km away
  6. 1.7124 km SSW of Atka, Alaska · 2629 days ago · 26 km deep · 89 km away
  7. 1.7119 km SSW of Atka, Alaska · 2629 days ago · 17 km deep · 93 km away
  8. 1.7185 km SSE of Atka, Alaska · 2630 days ago · 9 km deep · 72 km away
  9. 1.9192 km SSE of Atka, Alaska · 2638 days ago · 3 km deep · 75 km away
  10. 2.7221 km SSE of Atka, Alaska · 2639 days ago · 10 km deep · 70 km away
  11. 3.1156 km SSE of Atka, Alaska · 2640 days ago · 10 km deep · 100 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us600052z6 (also filed as ak0199xfuou0). Read Thu, Oct 1, 2026, 5:37 PM UTC.