QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgemsup16958157
USGS iscgemsup16958157
21 Aug 1911, 16:28
241 km WNW of Houma, Tonga
A magnitude 7.2 mB earthquake at 230 km depth.
Published location
Where is 241 km WNW of Houma, 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.
-20.004000, -177.265000
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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
iscgemsup16958157
Coordinates
-20.004, -177.265
Network
iscgemsup
Significance
798