QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem905823
USGS iscgem905823
21 Sept 1933, 10:47
off the east coast of Honshu, Japan
A magnitude 6.3 mw earthquake at 15 km depth.
Published location
Where is off the east coast of Honshu, 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.
38.578000, 143.323000
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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
iscgem905823
Coordinates
38.578, 143.323
Network
iscgem
Significance
611