QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem912384
USGS iscgem912384
8 Dec 1921, 12:31
6 km NNW of Narita, Japan
A magnitude 6.4 mw earthquake at 60 km depth.
Published location
Where is 6 km NNW of Narita, 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.
35.843000, 140.294000
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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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Catalog fields and provenance
Event ID
iscgem912384
Coordinates
35.843, 140.294
Network
iscgem
Significance
636