The quake struck at 12:53 GMT with an epicentre 19.3 kilometres southeast of the city of Matias Romero, in the state of Oaxaca, the US Geological Survey reported. Mexican quake monitors gave the same figure.
In Mexico City work crews temporarily halted rescue operations, while the country's Civil Protection service said there were no reports that the new quake -- an apparent aftershock of Tuesday's powerful 7.1 tremor -- had affected the capital.
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