QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0002key
USGS usp0002key
4 Oct 1985, 09:41
Bonin Islands, Japan region
A magnitude 6.1 mw earthquake at 478.1 km depth.
Published location
Where is Bonin Islands, Japan region?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
27.558000, 139.964000
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What the numbers mean
Magnitude measures event size; depth locates the source below the surface. Neither value alone establishes local damage or personal risk.
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Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
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Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
usp0002key
Coordinates
27.558, 139.964
Network
us
Significance
572