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USGS iscgem817699

5 Aug 1968, 17:17

31 km SW of Yawatahama, Japan

A magnitude 6.8 mw earthquake at 43.5 km depth.

Depth43.5 kmPublished hypocentral depth

Tsunami flagNot flaggedUSGS catalog flag, not a current warning

Updated19 December 2025Latest timestamp stored in this record

Published location

Where is 31 km SW of Yawatahama, 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.

33.251000, 132.195000

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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.

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Nearby events with a similar magnitude

31 km SSW of Hikari, Japan

22 km SW of Nagasaki, Japan

36 km E of Nobeoka, Japan

74 km NW of Hiratach?, Japan

28 km NNW of Maebaru-ch??, Japan

6 km ESE of Kumamoto, Japan

Catalog fields and provenance

Event ID

iscgem817699

Coordinates

33.251, 132.195

Network

iscgem

Significance

711