QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem913306
USGS iscgem913306
11 Oct 1918, 14:14
24 km NNW of San Antonio, Puerto Rico
A magnitude 7.1 mw earthquake at 15 km depth.
Published location
Where is 24 km NNW of San Antonio, Puerto Rico?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
18.700000, -67.189000
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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
iscgem913306
Coordinates
18.7, -67.189
Network
iscgem
Significance
776