QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem844300
USGS iscgem844300
10 Aug 1966, 06:01
Tonga
A magnitude 6 mw earthquake at 98.8 km depth.
Published location
Where is 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.
-20.161000, -175.228000
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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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Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
iscgem844300
Coordinates
-20.161, -175.228
Network
iscgem
Significance
554