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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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3.8

86 km SSW of Unalaska, Alaska

18 October 2026, 11:02:43 (+03) 2026-10-18 08:02:43 UTC

2 sources: EMSC, USGS mb
Did you feel this earthquake?
Magnitude
3.8 mb
Depth
39.8 km
Coordinates
53.1507, -167.0050
Data consistency
89/100

Regional activity (100 km)

Last 24 hours
0
Last 7 days
2
Last 30 days
20

Approximate energy released

≈ 7.6 t TNT

3.16e+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): 2,7 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

21 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 15
  • M3 6
  • M4 0
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 4
  • 10–20 km 7
  • 20–40 km 7
  • 40–70 km 3
  • 70–150 km 0
  • 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
FOX ISLANDS, ALEUTIAN ISLANDS
 3.9 ml 24.5 km 08:02:42.468 Δt 0.7 sn · 6.48 km · ΔM +0.1 Original record
USGS Earthquake Hazards Program Displayed
86 km SSW of Unalaska, Alaska
 3.8 mb 39.8 km 08:02:43.165 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. 18.10.2026 12:12:29 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  2. 18.10.2026 12:09:17 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  3. 18.10.2026 12:08:18 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  4. 18.10.2026 12:03:05 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  5. 18.10.2026 12:02:02 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  6. 18.10.2026 11:59:55 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  7. 18.10.2026 11:56:48 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  8. 18.10.2026 11:54:42 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  9. 18.10.2026 11:49:37 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  10. 18.10.2026 11:45:20 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  11. 18.10.2026 11:44:17 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  12. 18.10.2026 11:42:12 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  13. 18.10.2026 11:37:58 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  14. 18.10.2026 11:36:53 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  15. 18.10.2026 11:29:33 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  16. 18.10.2026 11:27:27 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  17. 18.10.2026 11:25:22 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  18. 18.10.2026 11:23:17 · USGS · update

    depth: 24.5 → 39.8 latitude: 53.102 → 53.1507 longitude: -166.952 → -167.005 magnitude: 3.9 → 3.8 time: 2026-10-18T08:02:42.467+00:00 → 2026-10-18T08:02:43.165+00:00 location: 90 km SSW of Unalaska, Alaska → 86 km SSW of Unalaska, Alaska magnitude type: ml → mb

  19. 18.10.2026 11:23:17 · SISTEM · recompute

    depth: 24.5 → 39.8 latitude: 53.102 → 53.1507 longitude: -166.952 → -167.005 magnitude: 3.9 → 3.8 time: 2026-10-18T08:02:42.467Z → 2026-10-18 08:02:43.165+00:00 magnitude type: ml → mb

  20. 18.10.2026 11:22:12 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  21. 18.10.2026 11:17:53 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  22. 18.10.2026 11:15:45 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  23. 18.10.2026 11:14:40 · EMSC · update

    time: 2026-10-18T08:02:42.468+00:00 → 2026-10-18T08:02:42.467+00:00

  24. 18.10.2026 11:12:37 · SISTEM · recompute

    time: 2026-10-18T08:02:42.468Z → 2026-10-18 08:02:42.467+00:00 source count: 1 → 2 review status: automatic → reviewed confirming sources: emsc → emsc,usgs preferred source: 3 → 4

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