The location of the 1999 Puebla earthquake shows that this earthquake belongs to the class of disastrous intraplate earthquakes generated by fracturing of the continental lithosphere caused by the process of subduction. This is obvious from the vertical section across the Middle American Wadati-Benioff zone and from its position in the revised seismically active Los Azufres-Río Salado fracture zone delineated in the continental lithosphere of the North American plate.

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