"It was awful," said Mercedes Rojas Huerta, 57, who was sitting on a bench outside her home in Mexico City's trendy Condesa district, too frightened to go back inside. "It started to shake; the cars were going here and there. What do I do?"

She said she was still scared thinking of the Sept. 19 earthquake that caused 228 deaths in the capital and 141 more in nearby states. Many buildings in Mexico City are still damaged from that quake.

The U.S. Geological Survey originally put the magnitude of Friday's quake at 7.5 but later lowered it to 7.2. It said the epicenter was 33 miles (53 kilometers) northeast of Pinotepa in southern Oaxaca state. It had a depth of 15 miles (24 kilometers).

Mexican Civil Protection chief Luis Felipe Puente tweeted that there were no immediate reports of damages from the quake. The Oaxaca state government said via Twitter that only material damages were reported near Pinotepa and Santiago Jamiltepec, but that shelters were opened for those fleeing damaged homes.