Alaska earthquakes

M2.8 earthquake 171 km E of Atka, Alaska

A magnitude 2.8 earthquake struck 171 km E of Atka, Alaska on Sat, Oct 5, 2019, 7:59 AM HADT (16:59 UTC), 26 km (16 mi) below the surface.

A larger quake followed: M4.8 93 km ENE of Atka, Alaska. This one was a foreshock.

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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
2.8 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2019-10-05 16:59:40 UTC
Depth
25.8 km (16.0 mi), shallow
Epicenter
52.157° N, 171.687° 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
2.8ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.128 · 8 stations
2.4ML, 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 1.9 km horizontally, 11.8 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
202°, poorly surrounded by stations
Stations used
19

Nearby

Within 100 km, magnitude 1.5 and up: 16 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 3.0159 km SW of Nikolski, Alaska · 2553 days ago · 10 km deep · 96 km away
  2. 2.2117 km ESE of Atka, Alaska · 2552 days ago · 8 km deep · 86 km away
  3. 3.5182 km E of Atka, Alaska · 2546 days ago · 35 km deep · 16 km away
  4. 2.8165 km SW of Nikolski, Alaska · 2546 days ago · 35 km deep · 56 km away
  5. 2.5165 km SW of Nikolski, Alaska · 2546 days ago · 35 km deep · 58 km away
  6. 3.8176 km W of Nikolski, Alaska · 2545 days ago · 114 km deep · 63 km away
  7. 3.375 km E of Atka, Alaska · 2539 days ago · 10 km deep · 96 km away
  8. 2.4146 km ENE of Atka, Alaska · 2538 days ago · 87 km deep · 81 km away
  9. 2.7173 km SW of Nikolski, Alaska · 2530 days ago · 35 km deep · 64 km away
  10. 4.893 km ENE of Atka, Alaska · 2523 days ago · 128 km deep · 94 km away · tsunami flag
  11. 3.9181 km WSW of Nikolski, Alaska · 2523 days ago · 47 km deep · 29 km away
  12. 3.7176 km ESE of Atka, Alaska · 2518 days ago · 35 km deep · 34 km away
  13. 2.3103 km ESE of Atka, Alaska · 2514 days ago · 14 km deep · 92 km away
  14. 2.8158 km E of Atka, Alaska · 2514 days ago · 33 km deep · 18 km away
  15. 2.889 km ENE of Atka, Alaska · 2506 days ago · 136 km deep · 87 km away
  16. 3.7150 km SW of Nikolski, Alaska · 2505 days ago · 35 km deep · 84 km away

Before

  1. 2.8107 km ESE of Atka, Alaska · 2555 days ago · 19 km deep · 84 km away
  2. 2.6161 km SW of Nikolski, Alaska · 2555 days ago · 35 km deep · 64 km away
  3. 3.7126 km WSW of Nikolski, Alaska · 2555 days ago · 49 km deep · 84 km away
  4. 4.0148 km SW of Nikolski, Alaska · 2562 days ago · 27 km deep · 72 km away
  5. 2.1134 km E of Atka, Alaska · 2565 days ago · 52 km deep · 38 km away
  6. 3.0174 km ESE of Atka, Alaska · 2569 days ago · 35 km deep · 55 km away
  7. 3.9133 km WSW of Nikolski, Alaska · 2570 days ago · 46 km deep · 80 km away
  8. 2.475 km E of Atka, Alaska · 2573 days ago · 7 km deep · 96 km away
  9. 2.9173 km WSW of Nikolski, Alaska · 2581 days ago · 35 km deep · 37 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000633f (also filed as ak019cs1a588). Read Fri, Oct 2, 2026, 9:46 AM UTC.