The magnitude 7.8 quake, which hit in the early darkness of a winter morning, worst to strike Turkey this century.
It was followed in the early afternoon by another large quake, magnitude 7.7.
Turkish President Tayyip Erdogan said 912 people were killed, 5,383 injured, and 2,818 buildings had collapsed in Turkey.
Also read: India to send search and rescue, medical teams and relief to quake-hit Turkey.
"Everyone is putting their heart and soul into efforts although winter season, cold weather and the earthquake happening during the night makes things more difficult," he said.
Also read: European Union sends over 10 rescue teams to Turkey after deadly quake.
“The combination of large magnitude and shallow depth made this earthquake extremely destructive," Mohammad Kashani, Associate Professor of Structural and Earthquake Engineering at the University of Southampton, said. »