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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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4.8

54 km E of Tomioka, Japan

27 October 2026, 03:25:08 (+03) 2026-10-27 00:25:08 UTC

3 sources: EMSC, USGS, GFZ mb
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Magnitude
4.8 mb
Depth
48.9 km
Coordinates
37.3869, 141.6250
Data consistency
94/100

Regional activity (100 km)

Last 24 hours
0
Last 7 days
4
Last 30 days
9

Approximate energy released

≈ 239 t TNT

1.00e+12 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

10 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 0
  • M3 3
  • M4 6
  • M5 1
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 0
  • 10–20 km 1
  • 20–40 km 1
  • 40–70 km 5
  • 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
 4.8 mb 50.0 km 00:25:08.610 Δt 0.44 sn · 5.81 km · ΔM 0 Original record
USGS Earthquake Hazards Program Displayed
54 km E of Tomioka, Japan
 4.8 mb 48.9 km 00:25:08.167 Δt 0 sn · 0 km · ΔM 0 Original record
GFZ GEOFON
Near East Coast of Honshu, Japan
 4.9 mb 59.5 km 00:25:10.460 Δt 2.29 sn · 16.45 km · ΔM +0.1 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) GEOFON Program, GFZ Helmholtz Centre for Geosciences — CC BY 4.0

Revision history

  1. 27.10.2026 10:45:29 · EMSC · update

    depth: 48.9 → 50 latitude: 37.3869 → 37.398 longitude: 141.625 → 141.5609 time: 2026-10-27T00:25:08.167+00:00 → 2026-10-27T00:25:08.610+00:00

  2. 27.10.2026 03:58:06 · SISTEM · recompute

    depth: 48.9 → 48.93 source count: 2 → 3 review status: automatic → reviewed confirming sources: emsc,gfz → emsc,usgs,gfz preferred source: 3 → 4

  3. 27.10.2026 03:58:05 · EMSC · update

    depth: 59.5 → 48.9 latitude: 37.443 → 37.3869 longitude: 141.453 → 141.625 magnitude: 4.7 → 4.8 time: 2026-10-27T00:25:10.460+00:00 → 2026-10-27T00:25:08.167+00:00 magnitude type: ml → mb

  4. 27.10.2026 03:58:05 · SISTEM · recompute

    depth: 59.5 → 48.9 latitude: 37.443 → 37.3869 longitude: 141.453 → 141.625 magnitude: 4.7 → 4.8 time: 2026-10-27T00:25:10.460Z → 2026-10-27 00:25:08.167+00:00 magnitude type: ml → mb

  5. 27.10.2026 03:55:00 · SISTEM · recompute

    magnitude: 4.9 → 4.7 source count: 1 → 2 magnitude type: mb → ml confirming sources: gfz → emsc,gfz preferred source: 5 → 3

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