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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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4.4

259 km WSW of Adak, Alaska

27 September 2026, 13:30:26 (+03) 2026-09-27 10:30:26 UTC

2 sources: EMSC, USGS mb
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Magnitude
4.4 mb
Depth
18.0 km
Coordinates
51.2307, 179.7625
Data consistency
89/100

Regional activity (100 km)

Last 24 hours
0
Last 7 days
1
Last 30 days
14

Approximate energy released

≈ 60 t TNT

2.51e+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): 3,2 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 5
  • M4 5
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 2
  • 10–20 km 9
  • 20–40 km 2
  • 40–70 km 6
  • 70–150 km 2
  • 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
 4.4 mb 2.4 km 10:30:23.490 Δt 2.93 sn · 7.16 km · ΔM 0 Original record
USGS Earthquake Hazards Program Displayed
259 km WSW of Adak, Alaska
 4.4 mb 18.0 km 10:30:26.420 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 17:40:29 · EMSC · update

    depth: 20 → 2.4 latitude: 51.2 → 51.1667 longitude: 179.84 → 179.7511 magnitude: 4.5 → 4.4 time: 2026-09-27T10:30:25.500+00:00 → 2026-09-27T10:30:23.490+00:00

  2. 27.09.2026 15:04:03 · EMSC · update

    depth: 18 → 20 latitude: 51.2307 → 51.2 longitude: 179.7625 → 179.84 magnitude: 4.4 → 4.5 time: 2026-09-27T10:30:26.420+00:00 → 2026-09-27T10:30:25.500+00:00

  3. 27.09.2026 13:49:57 · SISTEM · recompute

    depth: 18 → 18.01 source count: 1 → 2 review status: automatic → reviewed confirming sources: emsc → emsc,usgs preferred source: 3 → 4

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