QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/us1000gef4
USGS us1000gef4
21 Aug 2018, 07:24
126 km NE of Hihifo, Tonga
A magnitude 5.1 mb earthquake at 10 km depth.
Published location
Where is 126 km NE 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.
-15.057800, -173.067500
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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
us1000gef4
Coordinates
-15.0578, -173.0675
Network
us
Significance
400