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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

Bonin Islands, Japan region

25 October 2026, 05:36:32 (+03) 2026-10-25 02:36:32 UTC

3 sources: EMSC, USGS, GFZ mb
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Magnitude
4.8 mb
Depth
498.9 km
Coordinates
27.6872, 139.7389
Data consistency
99/100

Regional activity (100 km)

Last 24 hours
0
Last 7 days
1
Last 30 days
8

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

8 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 0
  • M3 0
  • M4 6
  • 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 8

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

Sources report different values.
Agency Magnitude Depth Time (UTC) Difference from master Original record
EMSC-CSEM
BONIN ISLANDS, JAPAN REGION
 4.8 mb 501.2 km 02:36:32.740 Δt 0.05 sn · 3.35 km · ΔM 0 Original record
USGS Earthquake Hazards Program Displayed
Bonin Islands, Japan region
 4.8 mb 498.9 km 02:36:32.787 Δt 0 sn · 0 km · ΔM 0 Original record
GFZ GEOFON
Bonin Islands, Japan Region
 5.0 mb 503.2 km 02:36:33.200 Δt 0.41 sn · 0.78 km · ΔM +0.2 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. 25.10.2026 10:45:06 · EMSC · update

    depth: 498.9 → 501.2 latitude: 27.6872 → 27.6688 longitude: 139.7389 → 139.712 time: 2026-10-25T02:36:32.787+00:00 → 2026-10-25T02:36:32.740+00:00

  2. 25.10.2026 05:53:25 · GFZ · update

    depth: 498.7 → 503.2 latitude: 27.629 → 27.694 longitude: 139.94 → 139.737 time: 2026-10-25T02:36:32.280+00:00 → 2026-10-25T02:36:33.200+00:00

  3. 25.10.2026 05:52:54 · SISTEM · recompute

    depth: 498.9 → 498.88 source count: 2 → 3 review status: automatic → reviewed confirming sources: emsc,gfz → emsc,usgs,gfz preferred source: 3 → 4

  4. 25.10.2026 05:52:53 · SISTEM · recompute

    depth: 498.7 → 498.9 latitude: 27.629 → 27.6872 longitude: 139.94 → 139.7389 magnitude: 5 → 4.8 time: 2026-10-25T02:36:32.280Z → 2026-10-25 02:36:32.787+00:00 source count: 1 → 2 confirming sources: gfz → emsc,gfz preferred source: 5 → 3

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