QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem913341
USGS iscgem913341

12 Nov 1918, 21:44

18 km NNW of San Antonio, Puerto Rico

A magnitude 6.1 mw earthquake at 15 km depth.

Depth15 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated25 April 2022Latest timestamp stored in this record

Published location

Where is 18 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.

18.637000, -67.180000

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Map data © OpenStreetMap contributors

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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Nearby events with a similar magnitude

M 6.1

15 km WNW of San Antonio, Puerto Rico

M 6.1

74 km NNE of The Valley, Anguilla

M 6.1

22 km NNE of Saint Croix, U.S. Virgin Islands

M 6.1

91 km N of Charlotte Amalie, U.S. Virgin Islands

M 6.19

131 km NNE of Cruz Bay, U.S. Virgin Islands

M 6.05

220 km N of San Juan, Puerto Rico

Catalog fields and provenance
Event ID
iscgem913341
Coordinates
18.637, -67.18
Network
iscgem
Significance
576