The U.S. Geological Survey said a magnitude-5.5 quake hit at 7:04 a.m. (9:04 a.m. EDT; 1304 GMT), centered about 10 miles (17 kilometers) west-southwest of Pinotepa Nacional on the Pacific Coast and 227 miles (365 kilometers) south-southeast of Mexico City.
Mexico Seismology Service initially calculated the quake's magnitude at 5.9.
A second quake shook the region a few minutes later.
Mexico City's soft soil makes it especially sensitive to distant earthquakes. But Mayor Manuel Mancera said in a Twitter post that no damage was reported. Local news media also said there were no reports of damage close to Pinotepa Nacional.
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