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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

153 km WNW of Adak, Alaska

25 October 2026, 20:49:58 (+03) 2026-10-25 17:49:58 UTC

3 sources: EMSC, USGS, GFZ mb
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Magnitude
4.6 mb
Depth
152.9 km
Coordinates
52.1923, -178.8056
Data consistency
86/100

Regional activity (100 km)

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

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): 2,1 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

8 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 6
  • M3 1
  • M4 1
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 1
  • 10–20 km 4
  • 20–40 km 1
  • 40–70 km 0
  • 70–150 km 1
  • 150+ km 1

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
ANDREANOF ISLANDS, ALEUTIAN IS.
 4.6 mb 162.5 km 17:49:58.670 Δt 0.25 sn · 27.41 km · ΔM 0 Original record
USGS Earthquake Hazards Program Displayed
153 km WNW of Adak, Alaska
 4.6 mb 152.9 km 17:49:58.419 Δt 0 sn · 0 km · ΔM 0 Original record
GFZ GEOFON
Andreanof Islands, Aleutian Islands
 4.8 mb 153.7 km 17:49:58.320 Δt 0.1 sn · 6.71 km · ΔM +0.2 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) GEOFON Program, GFZ Helmholtz Centre for Geosciences — CC BY 4.0

Revision history

  1. 26.10.2026 10:42:41 · EMSC · update

    depth: 156.1 → 162.5 latitude: 52.19 → 51.946 longitude: -178.7922 → -178.803 time: 2026-10-25T17:49:58.320+00:00 → 2026-10-25T17:49:58.670+00:00

  2. 25.10.2026 22:42:16 · EMSC · update

    depth: 152.9 → 156.1 latitude: 52.1923 → 52.19 longitude: -178.8056 → -178.7922 time: 2026-10-25T17:49:58.419+00:00 → 2026-10-25T17:49:58.320+00:00

  3. 25.10.2026 21:36:04 · SISTEM · recompute

    source count: 2 → 3 confirming sources: emsc,usgs → emsc,usgs,gfz

  4. 25.10.2026 21:10:31 · SISTEM · recompute

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

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