QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp000251s
USGS usp000251s
15 Jun 1984, 15:22
111 km W of Hihifo, Tonga
A magnitude 6.6 mw earthquake at 246.6 km depth.
Published location
Where is 111 km W 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.
-15.816000, -174.831000
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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
usp000251s
Coordinates
-15.816, -174.831
Network
us
Significance
670