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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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4.1

Rat Islands, Aleutian Islands, Alaska

17 October 2026, 12:52:05 (+03) 2026-10-17 09:52:05 UTC

2 sources: EMSC, USGS mb
Did you feel this earthquake?
Magnitude
4.1 mb
Depth
94.7 km
Coordinates
51.7144, 178.5888
Data consistency
88/100

Regional activity (100 km)

Last 24 hours
0
Last 7 days
4
Last 30 days
17

Approximate energy released

≈ 21 t TNT

8.91e+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?

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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 Maximum intensity (MMI): 2,3 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 11
  • M3 6
  • M4 4
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 4
  • 10–20 km 6
  • 20–40 km 1
  • 40–70 km 5
  • 70–150 km 5
  • 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
RAT ISLANDS, ALEUTIAN ISLANDS
 4.0 ml 87.1 km 09:52:05.634 Δt 0.59 sn · 9.86 km · ΔM -0.1 Original record
USGS Earthquake Hazards Program Displayed
Rat Islands, Aleutian Islands, Alaska
 4.1 mb 94.7 km 09:52:05.043 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 08:18:52 · USGS · update

    depth: 87.1 → 94.7 latitude: 51.626 → 51.7144 longitude: 178.578 → 178.5888 magnitude: 4 → 4.1 time: 2026-10-17T09:52:05.633+00:00 → 2026-10-17T09:52:05.043+00:00 magnitude type: ml → mb

  2. 18.10.2026 08:18:52 · SISTEM · recompute

    depth: 87.1 → 94.7 latitude: 51.626 → 51.7144 longitude: 178.578 → 178.5888 magnitude: 4 → 4.1 time: 2026-10-17T09:52:05.633Z → 2026-10-17 09:52:05.043+00:00 magnitude type: ml → mb

  3. 17.10.2026 19:41:49 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  4. 17.10.2026 19:40:50 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  5. 17.10.2026 19:35:34 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  6. 17.10.2026 19:30:20 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  7. 17.10.2026 19:28:00 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  8. 17.10.2026 19:22:46 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  9. 17.10.2026 19:17:38 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  10. 17.10.2026 19:16:36 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  11. 17.10.2026 19:14:33 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  12. 17.10.2026 19:13:31 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  13. 17.10.2026 19:11:28 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  14. 17.10.2026 19:07:15 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  15. 17.10.2026 19:06:05 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  16. 17.10.2026 19:02:58 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  17. 17.10.2026 18:58:48 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  18. 17.10.2026 18:57:45 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  19. 17.10.2026 18:56:43 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  20. 17.10.2026 18:55:40 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  21. 17.10.2026 18:50:29 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  22. 17.10.2026 18:45:14 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  23. 17.10.2026 18:44:04 · EMSC · update

    time: 2026-10-17T09:52:05.634+00:00 → 2026-10-17T09:52:05.633+00:00

  24. 17.10.2026 18:43:04 · SISTEM · recompute

    source count: 1 → 2 confirming sources: usgs → emsc,usgs

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