JOIN USEarthquakes shook a broad swath of southern Mexico today, causing buildings to sway in the capital and sending thousands fleeing into the streets as an earthquake alarm sounded.
But there were no immediate reports of damages or injuries.
The US Geological Survey said a magnitude-5.5 quake hit at 7:04 am (1304 GMT), centred about 17 kilometres west-southwest of Pinotepa Nacional on the Pacific Coast and 365 kilometres 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.