QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0004axa
USGS usp0004axa
23 Jun 1990, 22:38
139 km WSW of Haveluloto, Tonga
A magnitude 6.9 mw earthquake at 180.5 km depth.
Published location
Where is 139 km WSW of Haveluloto, 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.
-21.568000, -176.483000
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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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Catalog fields and provenance
Event ID
usp0004axa
Coordinates
-21.568, -176.483
Network
us
Significance
732