Alaska earthquakes

M3.7 earthquake 150 km SW of Nikolski, Alaska

A magnitude 3.7 earthquake struck 150 km SW of Nikolski, Alaska on Sat, Nov 23, 2019, 1:11 AM HAST (11:11 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.1 79 km SSW of Nikolski, 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
2019-11-23 11:11:17 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
52.012° N, 170.480° 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 · ±0.167 · 10 stations
2.8ML, 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 3.6 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.17
Depth from
Operator assigned
Station coverage gap
219°, poorly surrounded by stations
Stations used
27

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 13 in the 30 days before it.

After

  1. 2.673 km SW of Nikolski, Alaska · 2504 days ago · 10 km deep · 77 km away
  2. 4.179 km SSW of Nikolski, Alaska · 2502 days ago · 35 km deep · 90 km away
  3. 4.173 km SSW of Nikolski, Alaska · 2501 days ago · 41 km deep · 88 km away
  4. 2.9114 km SSW of Nikolski, Alaska · 2501 days ago · 35 km deep · 53 km away
  5. 2.773 km SW of Nikolski, Alaska · 2499 days ago · 35 km deep · 78 km away
  6. 3.8160 km WSW of Nikolski, Alaska · 2490 days ago · 36 km deep · 38 km away
  7. 2.966 km SW of Nikolski, Alaska · 2484 days ago · 31 km deep · 85 km away
  8. 3.0101 km SW of Nikolski, Alaska · 2484 days ago · 35 km deep · 51 km away
  9. 2.658 km SW of Nikolski, Alaska · 2475 days ago · 10 km deep · 93 km away
  10. 2.9169 km SW of Nikolski, Alaska · 2447 days ago · 26 km deep · 34 km away

Before

  1. 2.781 km SSW of Nikolski, Alaska · 2511 days ago · 10 km deep · 95 km away
  2. 3.7176 km ESE of Atka, Alaska · 2519 days ago · 35 km deep · 85 km away
  3. 2.0110 km SW of Nikolski, Alaska · 2521 days ago · 46 km deep · 41 km away
  4. 3.255 km SW of Nikolski, Alaska · 2521 days ago · 133 km deep · 95 km away
  5. 3.072 km SW of Nikolski, Alaska · 2523 days ago · 35 km deep · 82 km away
  6. 3.9181 km WSW of Nikolski, Alaska · 2524 days ago · 47 km deep · 65 km away
  7. 2.585 km SSW of Nikolski, Alaska · 2528 days ago · 35 km deep · 70 km away
  8. 3.266 km SW of Nikolski, Alaska · 2530 days ago · 64 km deep · 85 km away
  9. 2.7173 km SW of Nikolski, Alaska · 2531 days ago · 35 km deep · 25 km away
  10. 3.9111 km SW of Nikolski, Alaska · 2532 days ago · 35 km deep · 40 km away
  11. 3.087 km WSW of Nikolski, Alaska · 2535 days ago · 35 km deep · 81 km away
  12. 3.6107 km SW of Nikolski, Alaska · 2535 days ago · 44 km deep · 45 km away
  13. 5.8111 km SW of Nikolski, Alaska · 2535 days ago · 35 km deep · 41 km away · felt by 1 · tsunami flag

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60006ncm (also filed as ak019f0zcn5e). Read Sat, Oct 3, 2026, 1:48 PM UTC.