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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

227 km SSE of Atka, Alaska

31 October 2026, 19:41:34 (+03) 2026-10-31 16:41:34 UTC

2 sources: EMSC, USGS ml
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Magnitude
3.5 ml
Depth
10.0 km
Coordinates
50.2365, -173.2876
Data consistency
70/100

Regional activity (100 km)

Last 24 hours
0
Last 7 days
0
Last 30 days
4

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

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

4 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 1
  • M3 2
  • M4 1
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 0
  • 10–20 km 3
  • 20–40 km 1
  • 40–70 km 0
  • 70–150 km 0
  • 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
ANDREANOF ISLANDS, ALEUTIAN IS.
 3.4 ml 20.0 km 16:41:42.045 Δt 7.81 sn · 53.44 km · ΔM -0.1 Original record
USGS Earthquake Hazards Program Displayed
227 km SSE of Atka, Alaska
 3.5 ml 10.0 km 16:41:34.234 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. 03.11.2026 20:59:36 · USGS · update

    depth: 20 → 10 latitude: 50.55 → 50.2365 longitude: -173.857 → -173.2876 magnitude: 3.4 → 3.5 time: 2026-10-31T16:41:42.045+00:00 → 2026-10-31T16:41:34.234+00:00 location: 184 km S of Atka, Alaska → 227 km SSE of Atka, Alaska

  2. 03.11.2026 20:59:36 · SISTEM · recompute

    depth: 20 → 10 latitude: 50.55 → 50.2365 longitude: -173.857 → -173.2876 magnitude: 3.4 → 3.5 time: 2026-10-31T16:41:42.045Z → 2026-10-31 16:41:34.234+00:00

  3. 02.11.2026 12:11:39 · SISTEM · recompute

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

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