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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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4.6

100 km NNW of Nikolski, Alaska

24 October 2026, 02:08:25 (+03) 2026-10-23 23:08:25 UTC

2 sources: EMSC, USGS mb
Did you feel this earthquake?
Magnitude
4.6 mb
Depth
230.5 km
Coordinates
53.7815, -169.4133
Data consistency
67/100

Regional activity (100 km)

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

Approximate energy released

≈ 120 t TNT

5.01e+11 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): 1,0 Felt reports: 0 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

2 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 1
  • M3 0
  • M4 1
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 0
  • 10–20 km 0
  • 20–40 km 0
  • 40–70 km 0
  • 70–150 km 0
  • 150+ km 2

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
 4.0 ml 242.9 km 23:08:25.010 Δt 0.48 sn · 35.02 km · ΔM -0.6 Original record
USGS Earthquake Hazards Program Displayed
100 km NNW of Nikolski, Alaska
 4.6 mb 230.5 km 23:08:25.493 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. 26.10.2026 00:19:14 · USGS · update

    depth: 242.9 → 230.47 latitude: 53.502 → 53.7815 longitude: -169.17 → -169.4133 magnitude: 4 → 4.6 time: 2026-10-23T23:08:25.010+00:00 → 2026-10-23T23:08:25.493+00:00 location: 65 km NNW of Nikolski, Alaska → 100 km NNW of Nikolski, Alaska magnitude type: ml → mb

  2. 26.10.2026 00:19:14 · SISTEM · recompute

    depth: 242.9 → 230.47 latitude: 53.502 → 53.7815 longitude: -169.17 → -169.4133 magnitude: 4 → 4.6 time: 2026-10-23T23:08:25.010Z → 2026-10-23 23:08:25.493+00:00 magnitude type: ml → mb

  3. 24.10.2026 08:38:48 · SISTEM · recompute

    source count: 1 → 2 review status: automatic → reviewed confirming sources: emsc → emsc,usgs preferred source: 3 → 4

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