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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

Rat Islands, Aleutian Islands, Alaska

27 September 2026, 10:48:11 (+03) 2026-09-27 07:48:11 UTC

2 sources: EMSC, USGS mb
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Magnitude
4.6 mb
Depth
46.5 km
Coordinates
50.9044, 179.3215
Data consistency
90/100

Regional activity (100 km)

Last 24 hours
0
Last 7 days
1
Last 30 days
12

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): 3,3 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

19 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 7
  • M3 7
  • M4 5
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 2
  • 10–20 km 10
  • 20–40 km 0
  • 40–70 km 6
  • 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
RAT ISLANDS, ALEUTIAN ISLANDS
 4.6 mb 53.8 km 07:48:12.320 Δt 0.57 sn · 4.89 km · ΔM 0 Original record
USGS Earthquake Hazards Program Displayed
Rat Islands, Aleutian Islands, Alaska
 4.6 mb 46.5 km 07:48:11.749 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. 27.09.2026 17:39:25 · EMSC · update

    depth: 50 → 53.8 latitude: 51.03 → 50.9483 longitude: 179.3 → 179.3253 time: 2026-09-27T07:48:11.800+00:00 → 2026-09-27T07:48:12.320+00:00

  2. 27.09.2026 12:33:02 · EMSC · update

    depth: 46.5 → 50 latitude: 50.9044 → 51.03 longitude: 179.3215 → 179.3 time: 2026-09-27T07:48:11.749+00:00 → 2026-09-27T07:48:11.800+00:00

  3. 27.09.2026 11:06:46 · USGS · update

    depth: 34.1 → 46.52 latitude: 50.908 → 50.9044 longitude: 179.335 → 179.3215 magnitude: 5 → 4.6 time: 2026-09-27T07:48:12.407+00:00 → 2026-09-27T07:48:11.749+00:00 magnitude type: ml → mb

  4. 27.09.2026 11:06:46 · SISTEM · recompute

    depth: 34.1 → 46.52 latitude: 50.908 → 50.9044 longitude: 179.335 → 179.3215 magnitude: 5 → 4.6 time: 2026-09-27T07:48:12.407Z → 2026-09-27 07:48:11.749+00:00 magnitude type: ml → mb

  5. 27.09.2026 11:06:44 · SISTEM · recompute

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

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