QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem780171
USGS iscgem780171
10 Sept 1971, 07:28
72 km SSE of Pangai, Tonga
A magnitude 6 mw earthquake at 21.1 km depth.
Published location
Where is 72 km SSE of Pangai, 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.
-20.453000, -174.210000
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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
iscgem780171
Coordinates
-20.453, -174.21
Network
iscgem
Significance
561