QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/us7000fca8
USGS us7000fca8
18 Sept 2021, 01:56
21 km NNE of Hihifo, Tonga
A magnitude 5.1 mb earthquake at 66.7 km depth.
Published location
Where is 21 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.
-15.773900, -173.713300
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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
us7000fca8
Coordinates
-15.7739, -173.7133
Network
us
Significance
401