QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem903042
USGS iscgem903042
16 Apr 1937, 03:01
227 km WNW of Haveluloto, Tonga
A magnitude 7.3 mw earthquake at 330 km depth.
Published location
Where is 227 km WNW 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.
-20.596000, -177.315000
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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
iscgem903042
Coordinates
-20.596, -177.315
Network
iscgem
Significance
820