Three moderate earthquakes, the strongest with a preliminary magnitude of 5.0, shook Turkey's Aegean coast hours apart, the Kandilli Observatory said.
There were no immediate reports of damage or injuries.
The first two quakes had preliminary magnitudes of 4.3, the observatory said.
The third and larger quake was centered in the sea in the bay of Gokova and shook the resort towns of Marmaris, Bodrum and Datca, the observatory said.
Quakes are frequent in Turkey, much of which lies atop the active North Anatolian fault.
Two devastating earthquakes killed about 18,000 people in northwestern Turkey in 1999.
