QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem824168
USGS iscgem824168
21 Apr 1968, 09:34
138 km ESE of Kamaishi, Japan
A magnitude 6.3 mw earthquake at 25.2 km depth.
Published location
Where is 138 km ESE of Kamaishi, 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.
38.621000, 143.225000
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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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Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
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Catalog fields and provenance
Event ID
iscgem824168
Coordinates
38.621, 143.225
Network
iscgem
Significance
605