QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp000gxb9
USGS usp000gxb9
20 May 2009, 10:40
223 km S of ‘Ohonua, Tonga
A magnitude 5.1 mwc earthquake at 29.8 km depth.
Published location
Where is 223 km S 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.
-23.332000, -174.668000
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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
usp000gxb9
Coordinates
-23.332, -174.668
Network
us
Significance
400