QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem901515
USGS iscgem901515
1 Aug 1940, 16:08
137 km WSW of Rishiri Town, Japan
A magnitude 7.5 mw earthquake at 15 km depth.
Published location
Where is 137 km WSW of Rishiri Town, 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.
44.561000, 139.678000
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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
iscgem901515
Coordinates
44.561, 139.678
Network
iscgem
Significance
865