QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem773729
USGS iscgem773729
22 May 1972, 21:45
146 km NW of Neiafu, Tonga
A magnitude 7.1 mw earthquake at 223.7 km depth.
Published location
Where is 146 km NW of Neiafu, 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.
-17.777000, -175.026000
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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
iscgem773729
Coordinates
-17.777, -175.026
Network
iscgem
Significance
765