QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem886391
USGS iscgem886391
14 Apr 1957, 20:18
112 km NNE of Hihifo, Tonga
A magnitude 7.1 mw earthquake at 20 km depth.
Published location
Where is 112 km NNE 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.
-15.020000, -173.381000
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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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Catalog fields and provenance
Event ID
iscgem886391
Coordinates
-15.02, -173.381
Network
iscgem
Significance
771