Look: 2 dead after powerful 6.8-magnitude quake strikes Mexico capital

A magnitude 6.8 earthquake struck western Mexico early on Thursday, claiming the life of a woman in Mexico City who fell and hit her head as residents evacuated their homes during the country's second major temblor this week.

The Mexico City government said the woman stumbled on the stairs of her home in the city's central Doctores neighbourhood as quake alarms rang out and buildings began to shake.

The city also reported that a man in the south of the capital suffered a fatal heart attack after the quake.

In Mexico City's Roma Sur neighbourhood, alarmed residents ran outdoors in night dresses and pajamas, some wrapped only in blankets. Neighbours comforted each other, holding crying children and pets, as the quake alarm sounded four times.

The earthquake struck at 1:19 am near the epicenter of a magnitude 7.6 quake that hit three days earlier in the western state of Michoacan.

The US Geological Survey said Thursday’s earthquake was centered 50 kilometers south-southwest of Aguililla, Michoacan, at a depth of 24.1 kilometers.

Shortly after, Mexico City’s Mayor Claudia Sheinbaum said via Twitter that there were no immediate reports of damage in the capital. Residents were huddled in streets as seismic alarms blared.

The quake, which the US Geological Survey (USGS) first measured at magnitude 7.0, was weaker and deeper than Monday's temblor, striking at a depth of 20.7 km.

The USGS said that Thursday’s earthquake, like Monday’s, was centred in the western state of Michoacan near the Pacific coast.