Skip to content

USGS iscgem907024

21 Sept 1931, 03:20

1 km WNW of Kumagaya, Japan

A magnitude 6.5 mw earthquake at 15 km depth.

Depth15 kmPublished hypocentral depth

Tsunami flagNot flaggedUSGS catalog flag, not a current warning

Updated25 April 2022Latest timestamp stored in this record

Published location

Where is 1 km WNW of Kumagaya, 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.

36.140000, 139.380000

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.

Open the USGS event →

Continue exploring

Nearby events with a similar magnitude

103 km ESE of Iwaki, Japan

25 km SW of Shimoda, Japan

184 km SSE of Katsuura, Japan

153 km SSE of ?yama, Japan

94 km SSE of Shimoda, Japan

140 km SE of Katsuura, Japan

Catalog fields and provenance

Event ID

iscgem907024

Coordinates

36.14, 139.38

Network

iscgem

Significance

650