Data last collected:
QuakeFactsEvidence report · prepared 23 October 2026https://quakes99.com/entity/usp0000up9
USGS usp0000up9
23 May 1978, 08:50
29 km SW of Makurazaki, Japan
A magnitude 6.3 mb earthquake at 161 km depth.
Published location
Where is 29 km SW of Makurazaki, 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.
31.055000, 130.134000
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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
usp0000up9
Coordinates
31.055, 130.134
Network
us
Significance
611
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Questions this evidence can answer
01What exactly is this record?
Use the name, place, date and identifiers above to confirm that you have the right 29 km SW of Makurazaki, Japan earthquake: magnitude 6.3 and depth | QuakeFacts record.
02What does the evidence establish?
Read the reported values with their units, coverage dates and source notes. Keep observed facts separate from estimates or interpretation.
03What should I verify next?
Follow the primary-source links and check the limitations before using this evidence for a decision, comparison or citation.
A closer look at 29 km SW of Makurazaki, Japan
Depth in another unit
The recorded event depth of 161 km is approximately 100.04 miles below the source reference surface. Depth alone does not describe damage or local hazard.
Interpreting the recorded coordinates
The published position for 29 km SW of Makurazaki, Japan is 31.055° north and 130.134° east. This expresses the source coordinates in hemispheres; it does not establish an entrance, public access or a safe route.