QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem900477
USGS iscgem900477
21 Sept 1942, 06:52
190 km E of Iwaki, Japan
A magnitude 6.1 mw earthquake at 15 km depth.
Published location
Where is 190 km E of Iwaki, 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.
36.821000, 143.006000
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
iscgem900477
Coordinates
36.821, 143.006
Network
iscgem
Significance
567