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Significant earthquake

This summarises a recorded earthquake only; it is not a warning or a prediction. Follow AFAD and the competent authorities for official statements and guidance.

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3.1

177 km W of Nikolski, Alaska

21 October 2026, 02:35:39 (+03) 2026-10-20 23:35:39 UTC

2 sources: EMSC, USGS ml
Did you feel this earthquake?
Magnitude
3.1 ml
Depth
11.4 km
Coordinates
53.1482, -171.4921
Data consistency
90/100

Regional activity (100 km)

Last 24 hours
0
Last 7 days
0
Last 30 days
2

Approximate energy released

≈ 0.7 t TNT

2.82e+9 J

Approximated with the Gutenberg–Richter relation (log E = 1.5 M + 4.8); depends on magnitude type. Gutenberg & Richter (1956).

Did you feel this earthquake?

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Community reports

Based on voluntary reports from users; not an instrumental measurement or official intensity. For official information follow AFAD and Kandilli Observatory announcements.

Impact information reported by sources

  • USGS Earthquake Hazards Program Tsunami flag: No

These values are automatic products of the respective agency, not an assessment by this platform. For tsunami warnings follow the Kandilli Observatory Regional Earthquake-Tsunami Monitoring Center and AFAD.

Nearby places

No records.

Nearby faults (50 km)

No mapped fault within 50 km.

Last year, within 100 km

6 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 0
  • M3 6
  • M4 0
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 1
  • 10–20 km 1
  • 20–40 km 0
  • 40–70 km 1
  • 70–150 km 3
  • 150+ km 0

Largest previous earthquakes within 100 km

Largest earthquakes in the platform catalogue and entries from historical catalogues (with citation).

Comparison with past records

…

No earlier earthquakes are recorded in this area.

  • Source:

Where does this earthquake come from?

Source comparison

Sources report different values.
Agency Magnitude Depth Time (UTC) Difference from master Original record
EMSC-CSEM
FOX ISLANDS, ALEUTIAN ISLANDS
 3.3 ml 16.8 km 23:35:40.406 Δt 0.72 sn · 4.7 km · ΔM +0.2 Original record
USGS Earthquake Hazards Program Displayed
177 km W of Nikolski, Alaska
 3.1 ml 11.4 km 23:35:39.684 Δt 0 sn · 0 km · ΔM 0 Original record

This value summarises agreement between sources; it is not a measure of scientific accuracy. Euro-Mediterranean Seismological Centre (EMSC-CSEM) — CC BY 4.0 U.S. Geological Survey (USGS) Earthquake Hazards Program — Public domain (U.S. Government)

Revision history

  1. 22.10.2026 02:04:59 · USGS · update

    depth: 16.8 → 11.4 latitude: 53.187 → 53.1482 longitude: -171.52 → -171.4921 magnitude: 3.3 → 3.1 time: 2026-10-20T23:35:40.405+00:00 → 2026-10-20T23:35:39.684+00:00 location: 180 km W of Nikolski, Alaska → 177 km W of Nikolski, Alaska

  2. 22.10.2026 02:04:59 · SISTEM · recompute

    depth: 16.8 → 11.4 latitude: 53.187 → 53.1482 longitude: -171.52 → -171.4921 magnitude: 3.3 → 3.1 time: 2026-10-20T23:35:40.405Z → 2026-10-20 23:35:39.684+00:00

  3. 21.10.2026 20:18:51 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  4. 21.10.2026 20:17:46 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  5. 21.10.2026 20:16:46 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  6. 21.10.2026 20:15:42 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  7. 21.10.2026 20:14:42 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  8. 21.10.2026 20:08:08 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  9. 21.10.2026 20:04:56 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  10. 21.10.2026 20:01:55 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  11. 21.10.2026 19:58:53 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  12. 21.10.2026 19:57:53 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  13. 21.10.2026 19:56:49 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  14. 21.10.2026 19:55:48 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  15. 21.10.2026 19:54:47 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  16. 21.10.2026 19:51:42 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  17. 21.10.2026 19:45:27 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  18. 21.10.2026 19:44:26 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  19. 21.10.2026 19:43:21 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  20. 21.10.2026 19:42:20 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  21. 21.10.2026 19:41:07 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  22. 21.10.2026 19:39:59 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  23. 21.10.2026 19:37:52 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  24. 21.10.2026 19:36:50 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  25. 21.10.2026 19:35:48 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  26. 21.10.2026 19:34:47 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  27. 21.10.2026 19:33:43 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  28. 21.10.2026 19:28:31 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  29. 21.10.2026 19:27:29 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  30. 21.10.2026 19:25:24 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  31. 21.10.2026 19:24:24 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  32. 21.10.2026 19:22:18 · EMSC · update

    time: 2026-10-20T23:35:40.406+00:00 → 2026-10-20T23:35:40.405+00:00

  33. 21.10.2026 19:21:12 · SISTEM · recompute

    time: 2026-10-20T23:35:40.406Z → 2026-10-20 23:35:40.405+00:00 source count: 1 → 2 review status: automatic → reviewed confirming sources: emsc → emsc,usgs preferred source: 3 → 4

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