QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem780829
USGS iscgem780829
2 Aug 1971, 08:24
90 km SSE of Honchō, Japan
A magnitude 7 mw earthquake at 50 km depth.
Published location
Where is 90 km SSE of Honchō, Japan?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
41.413000, 143.432000
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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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Catalog fields and provenance
Event ID
iscgem780829
Coordinates
41.413, 143.432
Network
iscgem
Significance
756