A 7.2 magnitude quake rocked Mexico on Friday, a prolonged rumble that the government said had caused minor damage to buildings in the southern state of Oaxaca, but with no preliminary reports of deaths.The epicenter was about 90 miles (145 km) from Pacific coast surfer resort Puerto Escondido in the southern state of Oaxaca and had a depth of 15.3 miles (24.6 km), according to the US Geological Survey.Both the south of Mexico and the capital are still reeling from earthquakes that caused widespread damage in September and the powerful, sustained shaking on Friday caused widespread panic.Patricia Gutierrez, a 66-year-old English teacher, was taking a nap with her 11-month-old granddaughter, Juliet, when she heard an natural disaster alarm in Mexico City."She recognized the sound".
In Mexico City, where more than 200 people died in a large quake last fall, people streamed out of shaking buildings and into the streets.
Panicked residents ran into the streets to get away from tall buildings.
In Oaxaca, where the epicenter was located, authorities reported some structural damage to buildings in two towns, Pinotepa Nacional and Santiago Jamiltepec.
Standing in the middle of the street, her eyes glued to her fifth-floor apartment, Graciela Escalante, 72, could hardly speak.
The epicentre was close to a surfer resort on the Pacific coast in the southern state of Oaxaca and had a depth of 15.3 miles (24.6 km), according to the US Geological Survey.
Mexican President Enrique Peña Nieto has said that Mexico's National Civil Protection system protocols have been activated.
In Oaxaca, Gov. Alejandro Murat said via Twitter that damage was being evaluated, but there were so far no reports of deaths. But it added that shelters had been opened for those fleeing damaged homes.
A 5.9-magnitude aftershock hit almost an hour later.
The protocols in case of natural disaster were activated by the authorities of Mexico City, confirmed the head of government, Miguel Angel Mancera, in a message on his Twitter account.
Then on September 19 - the 32nd anniversary of a huge 1985 quake that killed 10,000 people - another 7.1 quake rocked the country, leaving 369 people dead.
Mexico City Mayor Miguel Angel Mancera reported "very minor" damage in the capital.
The latest tremor comes less than six months after last year's devastating earthquakes in central and southern Mexico.
A magnitude-5.8 aftershock struck the state of Oaxaca about an hour after the previous 7.2-magnitude quake.
Mexico sits at a spot where five tectonic plates come together, making it particularly vulnerable to earthquakes.