The death toll in Turkey rose to 18,342 by Friday morning and the number of injured stood at 74,242, the disaster management authority AFAD said.
In Syria, more than 3,300 have been killed, though rescuers have said many more people remain under rubble.
Some 24.4 million people in Syria and Turkey have been affected, according to Turkish officials and the United Nations, in an area spanning roughly 450 km (280 miles) from Adana in the west to Diyarbakir in the east. In Syria, people were killed as far south as Hama, 250 km from the epicentre.
Many people have set up shelters in supermarket car parks, mosques, roadsides or amid the ruins. Survivors are often desperate for food, water and heat, and working toilets are sparse in hard-hit areas.
