QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem902452
USGS iscgem902452
23 Apr 1938, 01:27
197 km ESE of Naze, Japan
A magnitude 6.3 mw earthquake at 15 km depth.
Published location
Where is 197 km ESE of Naze, 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.
27.938000, 131.431000
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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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Catalog fields and provenance
Event ID
iscgem902452
Coordinates
27.938, 131.431
Network
iscgem
Significance
614