A moderate magnitude 5.2 earthquake has struck southern Mexico, the country's seismology service says, triggering alarms and evacuation procedures in the capital although there were no immediate reports of casualties.

With over 100 people dead – and the death toll still rising -- Mexico City and central Mexico were rattled by a strong 7.1 magnitude earthquake that struck Tuesday afternoon.

A powerful earthquake has shaken Mexico City, causing buildings to sway sickeningly.