M5.6 earthquake – Bonin Islands, Japan Region
A magnitude 5.6 earthquake struck in the Bonin Islands, Japan region at 22:15 UTC on 25 Oct 2026, at a depth of 500 km, according to JMA, GFZ and USGS. The solution is preliminary and may be revised.
Reported by 3 agencies
Data: JMA, GFZ, USGS · updated 2026-10-25 22:28 UTC · automatic solution
- Magnitude
- 5.6moderate
JMA magnitude (Mj) - Depth
- 500 km
- Status
- Automatic
- Origin time
- 2026-10-25 22:15:00 UTC
- Epicentre
- 27.900° N, 140.000° E
Circles show this event and others within 80 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map
Nearby places
| Place | Distance | Est. shaking |
|---|---|---|
| No towns within 400 km. This is a remote area. | ||
Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more.
Every agency's solution
Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses JMA.
| Agency | Magnitude | Depth | Epicentre | Time offset | Status |
|---|---|---|---|---|---|
| JMAheadlineJMA via Japan Meteorological Agency | 5.6 Mj | 500 km | 27.90° N, 140.00° E | – | Automatic |
| GFZGFZ via GEOFON, GFZ Helmholtz Centre for Geosciences | 5.1 mbwas 5.2 | 491.7 km | 27.86° N, 139.68° E | −43.0 s | Automatic · 1 revision |
| USGSUSGS NEIC via U.S. Geological Survey | 5.3 mww | 485.1 km | 27.84° N, 139.68° E | −44.1 s | Reviewed |
How big was it?
Felt by most people over a wide area. Can damage poorly built structures close to the epicentre.
It released roughly the energy of 3.8 kt of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 500 km this was a deep earthquake, which spreads shaking over a wider area but less intensely.
M5.6 releases about 32× the energy of M4.6, and its waves are about 10× taller on a seismogram. Energy: 3.8 kt of TNT vs 120 t of TNT.
Each square is the energy of one M4.6. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
1 later earthquake within 80 km; the largest was M4.8 1 h 58 min ago. 6 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M5.6
1 later earthquake nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 0.02 | 4.8 | 482 |
Did you feel it?
Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.
Reports on SeismoAtlas
No reports yet.
Event id jma20261026071522. First recorded here 25 Oct 2026, 22:22:02 UTC. Solutions: JMA (jma:20261026071522); GFZ (geofon:gfz2026uyil); USGS (usgs:us6000u4we). Cite as: SeismoAtlas, “M5.6 earthquake – Bonin Islands, Japan Region”, https://seismoatlas.com/earthquake/jma20261026071522-m5-6-earthquake-bonin-islands-japan-region, data from JMA, GFZ, USGS.
JSON: /api/v1/events/jma20261026071522. SeismoAtlas is not an official warning service.