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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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5.5

5 km ESE of Asahi, Japan

28 October 2026, 18:07:52 (+03) 2026-10-28 15:07:52 UTC

2 sources: EMSC, USGS mww Under moderator review
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Magnitude
5.5 mww
Depth
41.4 km
Coordinates
35.7015, 140.7059
Data consistency
90/100

Regional activity (100 km)

Last 24 hours
0
Last 7 days
4
Last 30 days
15

Approximate energy released

≈ 2.7 kt TNT

1.12e+13 J

Approximated with the Gutenberg–Richter relation (log E = 1.5 M + 4.8); depends on magnitude type. Gutenberg & Richter (1956).

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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

17 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 0
  • M3 6
  • M4 8
  • M5 3
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 0
  • 10–20 km 1
  • 20–40 km 4
  • 40–70 km 9
  • 70–150 km 3
  • 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
NEAR EAST COAST OF HONSHU, JAPAN
 5.5 mw 48.1 km 15:07:52.940 Δt 0.89 sn · 5.65 km · ΔM 0 Original record
USGS Earthquake Hazards Program Displayed
5 km ESE of Asahi, Japan
 5.5 mww 41.4 km 15:07:52.050 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. 28.10.2026 18:44:58 · EMSC · update

    depth: 41.4 → 48.1 latitude: 35.7015 → 35.675 longitude: 140.7059 → 140.6526 time: 2026-10-28T15:07:52.050+00:00 → 2026-10-28T15:07:52.940+00:00

  2. 28.10.2026 18:24:37 · SISTEM · recompute

    depth: 41.4 → 41.36 source count: 1 → 2 magnitude type: mw → mww confirming sources: emsc → emsc,usgs preferred source: 3 → 4

  3. 28.10.2026 18:24:36 · EMSC · update

    depth: 14.3 → 41.4 latitude: 35.6962 → 35.7015 longitude: 140.549 → 140.7059 magnitude: 5.6 → 5.5 time: 2026-10-28T15:07:49.060+00:00 → 2026-10-28T15:07:52.050+00:00 magnitude type: ml → mw

  4. 28.10.2026 18:24:36 · SISTEM · recompute

    depth: 14.3 → 41.4 latitude: 35.6962 → 35.7015 longitude: 140.549 → 140.7059 magnitude: 5.6 → 5.5 time: 2026-10-28T15:07:49.060Z → 2026-10-28 15:07:52.050+00:00 magnitude type: ml → mw

  5. 28.10.2026 18:23:31 · EMSC · update

    depth: 46 → 14.3 latitude: 35.6762 → 35.6962 longitude: 140.5923 → 140.549 time: 2026-10-28T15:07:52.720+00:00 → 2026-10-28T15:07:49.060+00:00

  6. 28.10.2026 18:23:31 · SISTEM · recompute

    depth: 46 → 14.3 latitude: 35.6762 → 35.6962 longitude: 140.5923 → 140.549 time: 2026-10-28T15:07:52.720Z → 2026-10-28 15:07:49.060+00:00

  7. 28.10.2026 18:19:07 · EMSC · update

    latitude: 35.6669 → 35.6762 longitude: 140.6372 → 140.5923 time: 2026-10-28T15:07:52.330+00:00 → 2026-10-28T15:07:52.720+00:00

  8. 28.10.2026 18:19:07 · SISTEM · recompute

    latitude: 35.6669 → 35.6762 longitude: 140.6372 → 140.5923 time: 2026-10-28T15:07:52.330Z → 2026-10-28 15:07:52.720+00:00

  9. 28.10.2026 18:17:59 · EMSC · update

    depth: 16 → 46 latitude: 35.7637 → 35.6669 longitude: 140.7321 → 140.6372 time: 2026-10-28T15:07:50.590+00:00 → 2026-10-28T15:07:52.330+00:00

  10. 28.10.2026 18:17:59 · SISTEM · recompute

    depth: 16 → 46 latitude: 35.7637 → 35.6669 longitude: 140.7321 → 140.6372 time: 2026-10-28T15:07:50.590Z → 2026-10-28 15:07:52.330+00:00

  11. 28.10.2026 18:15:56 · EMSC · update

    latitude: 35.6682 → 35.7637 longitude: 140.8687 → 140.7321 time: 2026-10-28T15:07:50.130+00:00 → 2026-10-28T15:07:50.590+00:00

  12. 28.10.2026 18:15:56 · SISTEM · recompute

    latitude: 35.6682 → 35.7637 longitude: 140.8687 → 140.7321 time: 2026-10-28T15:07:50.130Z → 2026-10-28 15:07:50.590+00:00

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