QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0004k2n
USGS usp0004k2n
1 Jan 1991, 17:28
84 km E of ‘Ohonua, Tonga
A magnitude 6 mw earthquake at 29.1 km depth.
Published location
Where is 84 km E of ‘Ohonua, 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.
-21.208000, -174.149000
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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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Catalog fields and provenance
Event ID
usp0004k2n
Coordinates
-21.208, -174.149
Network
us
Significance
554