QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp00023uq
USGS usp00023uq
24 Apr 1984, 05:11
Izu Islands, Japan region
A magnitude 6.9 mw earthquake at 403.1 km depth.
Published location
Where is Izu 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.
30.909000, 138.431000
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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
usp00023uq
Coordinates
30.909, 138.431
Network
us
Significance
732