Southern Mexico Anguished mourners filled the streets of the cityJuchitan.
Emergency services in the southern state of Oaxaca said on Sunday there had been 71 confirmed fatalities in the state alone from Thursday night's 8.1 magnitude quake that struck off the coast of Chiapas.
The quake was stronger than a devastating 1985 temblor that flattened swathes of Mexico City and killed thousands.
At least 15 people died in the neighbouring state of Chiapas, according to local authorities, while another four deaths have also been confirmed in the state of Tabasco to the north.
More than 5,000 homes were destroyed and many more left without running water or electricity in Juchitan.
Relief efforts in the south continued through Saturday, with many of the people worst affected still wary of returning indoors to weakened buildings, fearing they could be brought down by ongoing aftershocks.
An epidemic and send people enough water and food, because there are places with no water supply," he added.
Government cargo planes delivered much-needed supplies and the military began distributing boxes of food, though many residents of this city in a region of Oaxaca state, known as the Isthmus, complained that progress was slow and they had not yet received assistance.
President Enrique Pena Nieto made a brief appearance on Friday afternoon in Juchitan's devastated downtown.
The long, juddering tremor was felt some 800km away in Mexico City and as far south as Honduras. The Mexican Seismological Service reported 721 aftershocks.