Observed earthquake
Bonin Islands, Japan region
Recent observationReported by 2 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 |
|---|---|---|---|---|---|---|
| USGSUnited States Geological Survey | M4.2 mb | 500 km | 2026-10-25 02:47:49 UTC | 27.88°N, 139.73°E | Reviewed by an analyst33 stations | us6000u4ru ↗ |
| EMSCEuropean-Mediterranean Seismological Centre | M4.2 mb | 497 km | 2026-10-25 02:47:48 UTC | 27.67°N, 139.75°E | Not stated | 20261025_0000043 ↗ |
Source: Earthquake data courtesy of the U.S. Geological Survey. · Retrieved: 2026-10-27 13:25:48 UTC
Source: Earthquake data from the European-Mediterranean Seismological Centre (EMSC) via SeismicPortal. · Retrieved: 2026-10-27 13:25:50 UTC · grouped with match confidence 88%
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.