A total of 61 people have been reported as the new death toll figure after an 8.2 natural disaster hit Mexico's Pacific Thursday night.
In neighboring Tabasco state, two children were killed, the governor said. It was initially measured at 8.1 on the Richter scale but the magnitude was later set at 8.4.
The system was expected to strike the Gulf coast in the state of Veracruz early on Saturday as a category two storm that could bring life-threatening floods. The quake damaged 1,700 homes, 700 schools and 18 other public buildings in Chiapas, according to preliminary estimates.
Hardest hit was Juchitan, a Oaxaca state city where 36 people died when the magnitude 8.1 quake toppled buildings.
Emergency services in the southern state of Oaxaca confirmed that 71 people were killed in the state alone. At least 60 people were reported dead.
Residents were advised that tsunami waves could hit within three hours off the coasts of Mexico, Guatemala, Panama, El Salvador, Costa Rica, Nicaragua, Honduras and Ecuador. The other, an infant on a respirator, died after the quake triggered a power outage.
President Enrique Pena Nieto who was closely overlooking the rescue operations said that the authorities are making attempts to re-establish supplies of water and food and provide medical attention to those who need it.
Almost 2,900 people have been evacuated from their homes in Veracruz, and 1,500 more relocated to storm shelters in the neighboring Puebla state, AP reports.
Mexico sits atop five tectonic plates, whose movement makes it one of the most seismically active countries in the world.
The quake that struck Mexico overnight matches the force of a magnitude 8.1 quake that hit the country on June 3, 1932, roughly 300 miles (500 kilometers) west of Mexico City.
The official added that the storm had left some 70,000 people without electricity and caused damage in 53 of the Gulf state's 212 municipalities, Reuters reports.
The quake struck at 11.49pm on Thursday (4.49am GMT on Friday), and its epicentre was 102 miles (165 kilometres) west of Tapachula in Chiapas.