QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem913745
USGS iscgem913745

29 Dec 1917, 22:50

31 km S of San Francisco Cozoaltepec, Mexico

A magnitude 7.2 mw earthquake at 20 km depth.

Depth20 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated26 April 2022Latest timestamp stored in this record

Published location

Where is 31 km S of San Francisco Cozoaltepec, Mexico?

This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.

15.533000, -96.755000

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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 7.2

127 km SW of La Esperanza (El Zapotal), Mexico

M 7.2

24 km W of Puerto Madero, Mexico

M 7.2

13 km NW of Ocozocoautla de Espinosa, Mexico

M 7.3

34 km SW of Puerto Madero, Mexico

M 7.04

70 km SW of Puerto Madero, Mexico

M 7.4

Near the coast of Oaxaca, Mexico

Catalog fields and provenance
Event ID
iscgem913745
Coordinates
15.533, -96.755
Network
iscgem
Significance
793