Alaska earthquakes

M3.7 earthquake 171 km SW of Nikolski, Alaska

A magnitude 3.7 earthquake struck 171 km SW of Nikolski, Alaska on Sat, Aug 10, 2019, 11:19 PM HADT (08:19 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.1 177 km E 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
3.7 (mb, body-wave), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2019-08-11 08:19:59 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
52.033° N, 170.912° 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
3.7mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.122 · 17 stations
3.4ML, 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 7.3 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.12
Depth from
Operator assigned
Station coverage gap
205°, poorly surrounded by stations
Stations used
49

Nearby

Within 100 km, magnitude 1.5 and up: 22 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 2.7143 km SW of Nikolski, Alaska · 2605 days ago · 35 km deep · 29 km away
  2. 2.7143 km E of Atka, Alaska · 2603 days ago · 47 km deep · 83 km away
  3. 2.9140 km SW of Nikolski, Alaska · 2603 days ago · 35 km deep · 32 km away
  4. 2.297 km SW of Nikolski, Alaska · 2601 days ago · 1 km deep · 85 km away
  5. 2.9119 km SW of Nikolski, Alaska · 2600 days ago · 35 km deep · 59 km away
  6. 2.399 km SW of Nikolski, Alaska · 2600 days ago · 50 km deep · 72 km away
  7. 3.7124 km SSW of Nikolski, Alaska · 2592 days ago · 10 km deep · 85 km away
  8. 4.1177 km E of Atka, Alaska · 2589 days ago · 45 km deep · 49 km away
  9. 3.9124 km SSW of Nikolski, Alaska · 2588 days ago · 10 km deep · 94 km away
  10. 2.9173 km WSW of Nikolski, Alaska · 2581 days ago · 35 km deep · 39 km away
  11. 2.9Fox Islands, Aleutian Islands, Alaska · 2579 days ago · 35 km deep · 86 km away
  12. 3.9133 km WSW of Nikolski, Alaska · 2570 days ago · 46 km deep · 40 km away
  13. 2.7109 km SW of Nikolski, Alaska · 2569 days ago · 35 km deep · 68 km away
  14. 3.0174 km ESE of Atka, Alaska · 2568 days ago · 35 km deep · 74 km away
  15. 2.1134 km E of Atka, Alaska · 2565 days ago · 52 km deep · 92 km away
  16. 4.0148 km SW of Nikolski, Alaska · 2562 days ago · 27 km deep · 24 km away
  17. 2.590 km SSW of Nikolski, Alaska · 2556 days ago · 133 km deep · 98 km away
  18. 3.7126 km WSW of Nikolski, Alaska · 2555 days ago · 49 km deep · 54 km away
  19. 2.6161 km SW of Nikolski, Alaska · 2555 days ago · 35 km deep · 11 km away
  20. 2.8171 km E of Atka, Alaska · 2554 days ago · 26 km deep · 55 km away
  21. 3.0159 km SW of Nikolski, Alaska · 2553 days ago · 10 km deep · 43 km away
  22. 3.580 km SW of Nikolski, Alaska · 2552 days ago · 35 km deep · 99 km away

Before

  1. 2.9235 km ESE of Atka, Alaska · 2614 days ago · 10 km deep · 85 km away
  2. 3.8135 km SW of Nikolski, Alaska · 2615 days ago · 45 km deep · 37 km away
  3. 3.7169 km ESE of Atka, Alaska · 2619 days ago · 49 km deep · 61 km away
  4. 3.0127 km SW of Nikolski, Alaska · 2621 days ago · 35 km deep · 47 km away
  5. 2.3104 km SW of Nikolski, Alaska · 2629 days ago · 27 km deep · 71 km away
  6. 3.2141 km W of Nikolski, Alaska · 2634 days ago · 148 km deep · 90 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us600053nt (also filed as ak019a8xq6dq). Read Fri, Oct 2, 2026, 6:04 AM UTC.