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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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3.5

158 km SW of Nikolski, Alaska

24 September 2026, 19:52:47 (+03) 2026-09-24 16:52:47 UTC

2 sources: EMSC, USGS ml
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Magnitude
3.5 ml
Depth
10.0 km
Coordinates
52.1563, -170.8080
Data consistency
90/100

Regional activity (100 km)

Last 24 hours
1
Last 7 days
10
Last 30 days
19

Approximate energy released

≈ 2.7 t TNT

1.12e+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): 2,5 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

32 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 8
  • M3 19
  • M4 5
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 2
  • 10–20 km 10
  • 20–40 km 8
  • 40–70 km 4
  • 70–150 km 8
  • 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

Sources report different values.
Agency Magnitude Depth Time (UTC) Difference from master Original record
EMSC-CSEM
FOX ISLANDS, ALEUTIAN ISLANDS
 3.7 ml 11.0 km 16:52:48.055 Δt 0.15 sn · 2.7 km · ΔM +0.2 Original record
USGS Earthquake Hazards Program Displayed
158 km SW of Nikolski, Alaska
 3.5 ml 10.0 km 16:52:47.906 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. 25.09.2026 16:32:37 · USGS · update

    depth: 11 → 10 latitude: 52.172 → 52.1563 longitude: -170.778 → -170.808 magnitude: 3.7 → 3.5 time: 2026-09-24T16:52:48.055+00:00 → 2026-09-24T16:52:47.906+00:00 location: 155 km SW of Nikolski, Alaska → 158 km SW of Nikolski, Alaska

  2. 25.09.2026 16:32:37 · SISTEM · recompute

    depth: 11 → 10 latitude: 52.172 → 52.1563 longitude: -170.778 → -170.808 magnitude: 3.7 → 3.5 time: 2026-09-24T16:52:48.055Z → 2026-09-24 16:52:47.906+00:00

  3. 24.09.2026 23:32:08 · SISTEM · recompute

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

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