QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp000327c
USGS usp000327c
6 Feb 1987, 12:23
80 km E of Iwaki, Japan
A magnitude 6.4 mw earthquake at 35.6 km depth.
Published location
Where is 80 km E of Iwaki, 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.
36.992000, 141.786000
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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
usp000327c
Coordinates
36.992, 141.786
Network
us
Significance
630