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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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3.9

107 km SSE of Adak, Alaska

17 October 2026, 06:33:59 (+03) 2026-10-17 03:33:59 UTC

2 sources: EMSC, USGS ml
Did you feel this earthquake?
Magnitude
3.9 ml
Depth
11.0 km
Coordinates
50.9517, -176.1727
Data consistency
86/100

Regional activity (100 km)

Last 24 hours
0
Last 7 days
5
Last 30 days
38

Approximate energy released

≈ 11 t TNT

4.47e+10 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?

Your report adds to a community map of where and how this earthquake was felt. It takes less than a minute.

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 Maximum intensity (MMI): 2,4 ShakeMap

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

42 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 29
  • M3 10
  • M4 3
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 5
  • 10–20 km 15
  • 20–40 km 21
  • 40–70 km 0
  • 70–150 km 1
  • 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

Agency Magnitude Depth Time (UTC) Difference from master Original record
EMSC-CSEM
ANDREANOF ISLANDS, ALEUTIAN IS.
 4.0 ml 11.7 km 03:34:02.020 Δt 2.66 sn · 14.86 km · ΔM +0.1 Original record
USGS Earthquake Hazards Program Displayed
107 km SSE of Adak, Alaska
 3.9 ml 11.0 km 03:33:59.365 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. 17.10.2026 07:52:02 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  2. 17.10.2026 07:49:56 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  3. 17.10.2026 07:48:56 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  4. 17.10.2026 07:44:47 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  5. 17.10.2026 07:43:45 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  6. 17.10.2026 07:40:38 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  7. 17.10.2026 07:37:36 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  8. 17.10.2026 07:36:31 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  9. 17.10.2026 07:35:28 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  10. 17.10.2026 07:34:27 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  11. 17.10.2026 07:33:24 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  12. 17.10.2026 07:30:19 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  13. 17.10.2026 07:27:01 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  14. 17.10.2026 07:26:00 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  15. 17.10.2026 07:24:55 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  16. 17.10.2026 07:23:51 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  17. 17.10.2026 07:22:52 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  18. 17.10.2026 07:19:42 · USGS · update

    depth: 11.7 → 10.97 latitude: 51.077 → 50.9517 longitude: -176.246 → -176.1727 magnitude: 4 → 3.9 time: 2026-10-17T03:34:02.019+00:00 → 2026-10-17T03:33:59.365+00:00 location: 92 km SSE of Adak, Alaska → 107 km SSE of Adak, Alaska

  19. 17.10.2026 07:19:42 · SISTEM · recompute

    depth: 11.7 → 10.97 latitude: 51.077 → 50.9517 longitude: -176.246 → -176.1727 magnitude: 4 → 3.9 time: 2026-10-17T03:34:02.019Z → 2026-10-17 03:33:59.365+00:00

  20. 17.10.2026 07:19:41 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  21. 17.10.2026 07:17:36 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  22. 17.10.2026 07:15:33 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  23. 17.10.2026 07:14:28 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  24. 17.10.2026 07:12:25 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  25. 17.10.2026 07:06:10 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  26. 17.10.2026 07:01:02 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  27. 17.10.2026 06:59:55 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  28. 17.10.2026 06:57:52 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  29. 17.10.2026 06:56:52 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  30. 17.10.2026 06:55:50 · EMSC · update

    time: 2026-10-17T03:34:02.020+00:00 → 2026-10-17T03:34:02.019+00:00

  31. 17.10.2026 06:53:45 · SISTEM · recompute

    time: 2026-10-17T03:34:02.020Z → 2026-10-17 03:34:02.019+00:00 source count: 1 → 2 review status: automatic → reviewed confirming sources: emsc → emsc,usgs preferred source: 3 → 4

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