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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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4.5

74 km SSE of Onagawa Chō, Japan

25 October 2026, 09:04:22 (+03) 2026-10-25 06:04:22 UTC

2 sources: EMSC, USGS mb
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Magnitude
4.5 mb
Depth
52.8 km
Coordinates
37.8490, 141.8415
Data consistency
89/100

Regional activity (100 km)

Last 24 hours
0
Last 7 days
6
Last 30 days
12

Approximate energy released

≈ 85 t TNT

3.55e+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

No records.

Nearby faults (50 km)

No mapped fault within 50 km.

Last year, within 100 km

14 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 0
  • M3 4
  • M4 9
  • 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 10
  • 70–150 km 2
  • 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
 4.5 mb 50.0 km 06:04:21.970 Δt 0.67 sn · 6.45 km · ΔM 0 Original record
USGS Earthquake Hazards Program Displayed
74 km SSE of Onagawa Chō, Japan
 4.5 mb 52.8 km 06:04:22.644 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. 25.10.2026 10:46:13 · EMSC · update

    depth: 52.8 → 50 latitude: 37.849 → 37.8037 longitude: 141.8415 → 141.8873 time: 2026-10-25T06:04:22.644+00:00 → 2026-10-25T06:04:21.970+00:00

  2. 25.10.2026 10:13:32 · EMSC · update

    magnitude: 4.2 → 4.5 magnitude type: m → mb

  3. 25.10.2026 09:31:29 · SISTEM · recompute

    depth: 52.8 → 52.78 magnitude: 4.2 → 4.5 source count: 1 → 2 review status: automatic → reviewed magnitude type: m → mb confirming sources: emsc → emsc,usgs preferred source: 3 → 4

  4. 25.10.2026 09:31:29 · EMSC · update

    depth: 40 → 52.8 latitude: 37.8 → 37.849 longitude: 141.8 → 141.8415 time: 2026-10-25T06:04:30.000+00:00 → 2026-10-25T06:04:22.644+00:00

  5. 25.10.2026 09:31:29 · SISTEM · recompute

    depth: 40 → 52.8 latitude: 37.8 → 37.849 longitude: 141.8 → 141.8415 time: 2026-10-25T06:04:30.000Z → 2026-10-25 06:04:22.644+00:00

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