QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem888278
USGS iscgem888278
22 May 1956, 04:01
90 km NE of Hihifo, Tonga
A magnitude 6.3 mw earthquake at 45 km depth.
Published location
Where is 90 km NE of Hihifo, Tonga?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
-15.326000, -173.263000
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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
iscgem888278
Coordinates
-15.326, -173.263
Network
iscgem
Significance
618