QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp00033ns
USGS usp00033ns
26 Mar 1987, 18:32
51 km E of ‘Ohonua, Tonga
A magnitude 6.1 mw earthquake at 81.3 km depth.
Published location
Where is 51 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.
-21.390000, -174.459000
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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
usp00033ns
Coordinates
-21.39, -174.459
Network
us
Significance
572