The U.S. Geological Survey says it calculates the earthquake that struck central Mexico as magnitude 7.1
It says the epicenter was near the town of Raboso, about 76 miles (123 kilometers) southeast of Mexico City.
Mexico's seismological agency calculated its preliminary magnitude at 6.8 and said its center was east of the city in the state of Puebla.
Earlier this month Mexico's strongest earthquake in a century left dozens dead.
Earlier in the day buildings across the city held preparation drills on the anniversary of the 1985 quake.
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