QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0000s79
USGS usp0000s79
23 Dec 1977, 21:14
104 km ESE of ?tsuchi, Japan
A magnitude 6 ms earthquake at 41 km depth.
Published location
Where is 104 km ESE of ?tsuchi, 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.
39.068000, 143.047000
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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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Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
usp0000s79
Coordinates
39.068, 143.047
Network
us
Significance
554