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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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4.2

Aegean Sea

31 October 2026, 04:01:58 (+03) 2026-10-31 01:01:58 UTC

5 sources: KANDILLI, EMSC, USGS, GFZ, NOA MLh
Did you feel this earthquake?
Magnitude
4.2 MLh
Depth
14.1 km
Coordinates
39.6817, 24.1818
Data consistency
95/100

Regional activity (100 km)

Last 24 hours
2
Last 7 days
27
Last 30 days
225

Approximate energy released

≈ 30 t TNT

1.26e+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

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

Nearby faults (50 km)

No mapped fault within 50 km.

Last year, within 100 km

253 earthquakes

By magnitude

  • M0 0
  • M1 81
  • M2 133
  • M3 31
  • M4 7
  • M5 1
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 68
  • 10–20 km 158
  • 20–40 km 25
  • 40–70 km 1
  • 70–150 km 0
  • 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

Agency Magnitude Depth Time (UTC) Difference from master Original record
Kandilli Rasathanesi (KOERI)
YUNANISTAN
 4.3 Mw 13.9 km 01:01:57.000 Δt 1.35 sn · 0.92 km · ΔM +0.1
EMSC-CSEM
AEGEAN SEA
 4.2 mw 12.0 km 01:01:59.900 Δt 1.55 sn · 2.51 km · ΔM 0 Original record
USGS Earthquake Hazards Program
35 km SSE of Sykiá, Greece
 4.2 mwr 10.0 km 01:01:59.344 Δt 1 sn · 9.91 km · ΔM 0 Original record
GFZ GEOFON
Aegean Sea
 4.2 Mw 10.0 km 01:01:59.960 Δt 1.61 sn · 5.88 km · ΔM 0 Original record
NOA – Institute of Geodynamics Displayed
Aegean Sea
 4.2 MLh 14.1 km 01:01:58.347 Δt 0 sn · 0 km · ΔM 0

This value summarises agreement between sources; it is not a measure of scientific accuracy. Boğaziçi Üniversitesi Kandilli Rasathanesi ve Deprem Araştırma Enstitüsü (KRDAE) Bölgesel Deprem-Tsunami İzleme ve Değerlendirme Merkezi — KRDAE kullanım izni ile 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 National Observatory of Athens, Institute of Geodynamics (NOA-IG) — NOA kullanım koşulları

Revision history

  1. 31.10.2026 12:55:47 · EMSC · update

    magnitude: 4.1 → 4.2 time: 2026-10-31T01:01:59.100+00:00 → 2026-10-31T01:01:59.900+00:00 magnitude type: ml → mw

  2. 31.10.2026 10:40:54 · EMSC · update

    magnitude type: mw → ml

  3. 31.10.2026 05:08:19 · EMSC · update

    magnitude type: ml → mw

  4. 31.10.2026 04:34:53 · NOA · update

    depth: 14.29 → 14.12 latitude: 39.68536 → 39.6817 longitude: 24.16718 → 24.18182 time: 2026-10-31T01:01:58.311+00:00 → 2026-10-31T01:01:58.347+00:00

  5. 31.10.2026 04:34:53 · SISTEM · recompute

    depth: 14.29 → 14.12 latitude: 39.68536 → 39.6817 longitude: 24.16718 → 24.18182 time: 2026-10-31T01:01:58.311Z → 2026-10-31 01:01:58.347+00:00

  6. 31.10.2026 04:23:04 · EMSC · update

    depth: 10 → 12 longitude: 24.24 → 24.19

  7. 31.10.2026 04:18:54 · SISTEM · recompute

    source count: 4 → 5 review status: automatic → reviewed confirming sources: kandilli,emsc,gfz,noa → kandilli,emsc,usgs,gfz,noa

  8. 31.10.2026 04:18:52 · EMSC · update

    magnitude type: mw → ml

  9. 31.10.2026 04:15:43 · EMSC · update

    magnitude type: ml → mw

  10. 31.10.2026 04:13:36 · SISTEM · recompute

    source count: 3 → 4 confirming sources: emsc,gfz,noa → kandilli,emsc,gfz,noa

  11. 31.10.2026 04:12:08 · NOA · update

    depth: 10 → 14.29 latitude: 39.66292 → 39.68536 longitude: 24.24731 → 24.16718 magnitude: 4.1 → 4.2 time: 2026-10-31T01:01:58.932+00:00 → 2026-10-31T01:01:58.311+00:00

  12. 31.10.2026 04:12:08 · SISTEM · recompute

    depth: 10 → 14.29 latitude: 39.66292 → 39.68536 longitude: 24.24731 → 24.16718 magnitude: 4.1 → 4.2 time: 2026-10-31T01:01:58.932Z → 2026-10-31 01:01:58.311+00:00

  13. 31.10.2026 04:09:02 · SISTEM · recompute

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

  14. 31.10.2026 04:07:57 · NOA · update

    latitude: 39.66175 → 39.66292 longitude: 24.25216 → 24.24731 time: 2026-10-31T01:01:58.898+00:00 → 2026-10-31T01:01:58.931+00:00

  15. 31.10.2026 04:07:57 · SISTEM · recompute

    latitude: 39.66175 → 39.66292 longitude: 24.25216 → 24.24731 time: 2026-10-31T01:01:58.898Z → 2026-10-31 01:01:58.932+00:00

  16. 31.10.2026 04:06:05 · EMSC · update

    latitude: 39.6618 → 39.66 longitude: 24.2522 → 24.24 time: 2026-10-31T01:01:58.898+00:00 → 2026-10-31T01:01:59.100+00:00

  17. 31.10.2026 04:05:55 · NOA · update

    latitude: 39.66459 → 39.66175 longitude: 24.24807 → 24.25216 time: 2026-10-31T01:01:58.750+00:00 → 2026-10-31T01:01:58.898+00:00

  18. 31.10.2026 04:05:55 · SISTEM · recompute

    latitude: 39.66459 → 39.66175 longitude: 24.24807 → 24.25216 time: 2026-10-31T01:01:58.750Z → 2026-10-31 01:01:58.898+00:00

  19. 31.10.2026 04:05:00 · SISTEM · recompute

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

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