MEXICO CITY: A 7.5-magnitude quake shook Mexico City on Friday in a prolonged rumble felt across the capital, according to the US Geological Survey (USGS).

The powerful earthquake triggered the capital's quake alarm system and causing buildings to sway.

Mexico's National Seismological Service put the magnitude of the quake at 7.0, and seismic monitor network Sky Alert said the quake was felt across the states of Guerrero, Oaxaca, and Puebla.

The USGS gave the quake's magnitude as 7.5, locating its epicentre just southeast of Pinotepa de Don Luis, in the southwestern state of Oaxaca.