Observed earthquake
Bonin Islands, Japan region
Recent observationReported by 3 agencies. Every solution below is that agency's own measurement, stored unaltered.
A reporting agency set the tsunami evaluation flag for this earthquake. That flag means the event met criteria for tsunami assessment — it is not itself a tsunami warning. Official tsunami warnings come only from your national tsunami warning centre.
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 |
|---|---|---|---|---|---|---|
| USGSUnited States Geological Survey | M6.5 mww | 492 km | 2026-10-25 02:09:23 UTC | 27.80°N, 139.62°E | Reviewed by an analyst124 stations | us6000u4r9 ↗ |
| EMSCEuropean-Mediterranean Seismological Centre | M6.5 mw | 490 km | 2026-10-25 02:09:23 UTC | 27.84°N, 139.61°E | Not stated | 20261025_0000031 ↗ |
| GEOFONGFZ Helmholtz Centre for Geosciences | M6.5 Mw | 501 km | 2026-10-25 02:09:24 UTC | 27.82°N, 139.59°E | Not stated | gfz2026uwur ↗ |
Source: Earthquake data courtesy of the U.S. Geological Survey. · Retrieved: 2026-10-27 13:25:48 UTC · grouped with match confidence 98%
Source: Earthquake data from the European-Mediterranean Seismological Centre (EMSC) via SeismicPortal. · Retrieved: 2026-10-27 13:25:50 UTC · grouped with match confidence 97%
Source: Earthquake solutions from the GEOFON programme, GFZ Helmholtz Centre for Geosciences. · Retrieved: 2026-10-27 13:25:52 UTC
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.