People standing outside their homes in Izmir, Turkey, on Friday.
Turkish President Recep Tayyip Erdogan said that among Turkey's injured, five people are being operated on and eight are in intensive care
TV footage showed water flooding through the streets of Cesme and Seferihisar in parts of Turkey's wider Izmir province, as well as on the Greek island of Samos, in what officials described as a "mini tsunami." No tsunami warnings were issued.
Idil Gungor, who works as a journalist and runs a guesthouse in the Turkish town of SiÄŸacik in Izmir province, said that the area was damaged more by the force of the water than the quake itself.
Her guesthouse, in a 100-year-old building, had been inundated and fish were swimming inside it, she said. Shops in town have also been flooded and their goods damaged.
"Everybody is calm but shocked and we're wondering what will happen, if there's a second tsunami coming or not," Gungor said.
Zeki Soysal, also a resident in Izmir province, told CNN Turk that he made it out of his office building just before it collapsed.
"There was an older woman in the building but we saved her, she got out. There is another building close to this building. They are continuing to try to get the people out," he said.
A wounded woman hugs her relative after being rescued from the debris of a building in the Bornova district of Izmir on Friday.
A wounded woman hugs her relative after being rescued from the debris of a building in the Bornova district of Izmir on Friday.
The United States Geological Survey (USGS) measured the tremor's magnitude at 7.0, while Turkish authorities said it was 6.6. The quake struck 14 kilometers (8.7 miles) northeast of the town of Néon Karlovásion on Samos, the USGS reported, at 1:51 pm Greek time (7:51a.m. ET).
But it hit at a relatively shallow depth of 21 kilometers (13 miles), the USGS reported, making its impact powerfully felt at ground level around the epicenter.
Authorities in both countries have reported dozens of aftershocks. Izmir Governor Yavuz Selim Köşger called on residents to stay off the roads and refrain from using mobile phones unnecessarily so that emergency vehicles could reach affected areas and response teams could communicate effectively.
In Greece, Samos Deputy Mayor Giorgos Dionisiou told Greek media that some old buildings had collapsed on the island.
Buildings were also destroyed on the Greek island of Samos; the country's public broadcaster said the quake caused a mini-tsunami in the area.
Buildings were also destroyed on the Greek island of Samos; the country's public broadcaster said the quake caused a mini-tsunami in the area.
People have been told by Greek authorities to stay away from the shore and buildings and to be on alert for high waves as aftershocks continue.