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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

Bonin Islands, Japan region

25 October 2026, 05:47:49 (+03) 2026-10-25 02:47:49 UTC

2 sources: EMSC, USGS mb
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Magnitude
4.2 mb
Depth
499.8 km
Coordinates
27.8771, 139.7294
Data consistency
82/100

Regional activity (100 km)

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

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).

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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

6 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 0
  • M3 0
  • M4 4
  • M5 1
  • M6 1
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 0
  • 10–20 km 0
  • 20–40 km 0
  • 40–70 km 0
  • 70–150 km 0
  • 150+ km 6

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
BONIN ISLANDS, JAPAN REGION
 4.2 mb 497.0 km 02:47:48.420 Δt 1.44 sn · 23.48 km · ΔM 0 Original record
USGS Earthquake Hazards Program Displayed
Bonin Islands, Japan region
 4.2 mb 499.8 km 02:47:49.856 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 10:45:06 · EMSC · update

    depth: 499.8 → 497 latitude: 27.8771 → 27.6661 longitude: 139.7294 → 139.7514 time: 2026-10-25T02:47:49.856+00:00 → 2026-10-25T02:47:48.420+00:00

  2. 25.10.2026 06:02:28 · SISTEM · recompute

    depth: 499.8 → 499.81 source count: 1 → 2 review status: automatic → reviewed confirming sources: emsc → emsc,usgs preferred source: 3 → 4

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