QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem900901
USGS iscgem900901
15 Jul 1941, 16:45
10 km NNE of Nagano, Japan
A magnitude 6.3 mw earthquake at 15 km depth.
Published location
Where is 10 km NNE of Nagano, 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.
36.733000, 138.242000
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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
iscgem900901
Coordinates
36.733, 138.242
Network
iscgem
Significance
607