QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem903843
USGS iscgem903843
18 Sept 1936, 19:38
Izu Islands, Japan region
A magnitude 6.1 mw earthquake at 15 km depth.
Published location
Where is Izu Islands, Japan region?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
31.123000, 142.030000
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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
iscgem903843
Coordinates
31.123, 142.03
Network
iscgem
Significance
580