QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp00031hm
USGS usp00031hm
9 Jan 1987, 08:01
231 km NW of Nuku‘alofa, Tonga
A magnitude 6.5 mw earthquake at 33 km depth.
Published location
Where is 231 km NW of Nuku‘alofa, 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.
-19.469000, -176.538000
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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
usp00031hm
Coordinates
-19.469, -176.538
Network
us
Significance
650