QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0004wvz
USGS usp0004wvz
21 Sept 1991, 16:19
90 km ESE of Hihifo, Tonga
A magnitude 6.1 mw earthquake at 17 km depth.
Published location
Where is 90 km ESE 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.
-16.232000, -173.004000
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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
usp0004wvz
Coordinates
-16.232, -173.004
Network
us
Significance
572