Observed earthquake
Bonin Islands, Japan region
Recent observationReported by 3 agencies. Every solution below is that agency's own measurement, stored unaltered.
Agency solutions
The same earthquake as measured independently by each agency. Values are never averaged or rewritten.
| Agency | Magnitude | Depth | Origin time | Epicentre | Review status | Source record |
|---|---|---|---|---|---|---|
| GEOFONGFZ Helmholtz Centre for Geosciences | M4.9 mb | 511 km | 2026-10-25 22:16:30 UTC | 27.84°N, 139.63°E | Not stated | gfz2026uyin ↗ |
| USGSUnited States Geological Survey | M4.8 mb | 482 km | 2026-10-25 22:16:27 UTC | 27.85°N, 139.73°E | Reviewed by an analyst82 stations | us6000u4wi ↗ |
| EMSCEuropean-Mediterranean Seismological Centre | M4.8 mb | 493 km | 2026-10-25 22:16:28 UTC | 27.83°N, 139.68°E | Not stated | 20261025_0000332 ↗ |
Source: Earthquake solutions from the GEOFON programme, GFZ Helmholtz Centre for Geosciences. · Retrieved: 2026-10-27 13:25:52 UTC
Source: Earthquake data courtesy of the U.S. Geological Survey. · Retrieved: 2026-10-27 13:25:48 UTC · grouped with match confidence 97%
Source: Earthquake data from the European-Mediterranean Seismological Centre (EMSC) via SeismicPortal. · Retrieved: 2026-10-27 13:25:50 UTC · grouped with match confidence 94%
Why the agencies differ
Differences of a few tenths of a magnitude unit and tens of kilometres are normal and expected. Each agency uses a different set of seismic stations, a different velocity model for the Earth's interior, and sometimes a different magnitude scale altogether. None of them is “wrong”; they are independent measurements of the same event.
Prakruti groups solutions only when they agree closely in both time and location, and shows the preferred solution — favouring an analyst-reviewed moment magnitude where one exists — while keeping every other solution visible above.