QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0004qhm
USGS usp0004qhm
19 Apr 1991, 12:25
171 km NW of Hihifo, Tonga
A magnitude 6.1 mw earthquake at 19.5 km depth.
Published location
Where is 171 km NW 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.
-14.883000, -174.953000
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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
usp0004qhm
Coordinates
-14.883, -174.953
Network
us
Significance
572