QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem858689
USGS iscgem858689
18 Mar 1965, 06:22
141 km NNW of Nuku‘alofa, Tonga
A magnitude 6.3 mw earthquake at 224.9 km depth.
Published location
Where is 141 km NNW of Nuku‘alofa, 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.
-20.036000, -175.890000
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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
iscgem858689
Coordinates
-20.036, -175.89
Network
iscgem
Significance
611