QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem901919
USGS iscgem901919
1 May 1939, 06:58
28 km W of Tenn?, Japan
A magnitude 7.2 mw earthquake at 10 km depth.
Published location
Where is 28 km W of Tenn?, 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.
39.930000, 139.637000
Open the interactive map ↗Map data © OpenStreetMap contributors
What the numbers mean
Magnitude measures event size; depth locates the source below the surface. Neither value alone establishes local damage or personal risk.
Need a current safety answer?
Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
Continue exploring
Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
iscgem901919
Coordinates
39.93, 139.637
Network
iscgem
Significance
795