"So far, there have been 48 aftershocks above 3.8 (magnitude)," Mexico's National Seismological Service said early Wednesday.
Tuesday's quake - the epicentre was in the southern Mexican state of Guerrero, near the Oaxaca state boundary - caused no deaths, but injured 11 people and damaged hundreds of buildings.
It was the largest quake in Mexico since the 8.1-magnitude temblor that claimed around 10,000 lives in September 1985.
Guerrero Governor Angel Aguirre said around 800 homes were damaged in that state, home to the resort city of Acapulco on the Pacific coast.
Mexico City Mayor Marcelo Ebrard estimated the damage at 3.6 million dollars.
"It is not so much money, we have insurance to cover such things," Ebrard told Mexican television.
However, about 300,000 people remained without water in the Mexico City districts of Iztapalapa and Tlahuac, due to damage caused by the quake on two aqueducts. A stretch of railway and two bridges also suffered damage.
In the capital, lessons were cancelled Wednesday in 62 schools to allow for inspections for damage.
Other parts of the country also suffered the effects of the quake.//DPA