Earthquakes in Bonin Islands, Japan Region
Right now
The most recent data we hold from GFZ arrived 17 hours ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
Reported by GFZ 104 days ago.
It is one of only 3 we have recorded within 20 km of this point since 31 May 2026. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
GFZ reported: Bonin Islands, Japan Region
GFZ recorded magnitude 4.8 at a depth of 514 km.
The seismic region given by the source is Bonin Islands, Japan Region.
Nearby, since 31 May 2026
- May 31, 2026 · score 5 · 7.6 km
- May 31, 2026 · score 5 · 7.6 km
How we know
Confirmed by 2 independent sources, including GFZ.
Our own score for this event is 7 out of 100, at 68 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Earthquakes |
| Severity | Low |
| Calamity Score (ours) | 7 / 100 |
| Our confidence | 68% |
| Coordinates | 27.4000, 139.8690 |
| Timestamp | 2026-05-31T12:26:40.080Z |
| Source | https://geofon.gfz-potsdam.de/eqinfo/event.php?id=gfz2026kpeb |
Score Breakdown
Technical Details
| Mag | 4.78 |
| Depth | 514.4 |
| MagType | mb |
| Region | Bonin Islands, Japan Region |
| Iris Mag | 4.5 |
| Iris Depth | 508.47 |
| Iris MagType | mb |
| Iris Region | BONIN ISLANDS, JAPAN REGION |
| MergedSources | [{"id":"iris_12113932","source":"iris","severity":"low","severityValue":27,"timestamp":1780230399000,"latitude":27.4636,"longitude":139.8402}] |
Safety Information
If you feel shaking: Drop, Cover, and Hold On. Move away from windows, heavy objects, and exterior walls. After shaking stops, check for injuries and structural damage. Be prepared for aftershocks, which can occur minutes to months after the mainshock. Follow instructions from local emergency management authorities.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
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