A 5.5-magnitude earthquake hit Turkey's southwest on Wednesday, authorities said.

In a written statement, the Disaster and Emergency Management Authority (AFAD) said the quake hit the Denizli province at 9:34am (local time).

Its epicentre was the province's southern countryside in Acipayam district, at a depth of 11.36 kilometres.

According to the European earthquake monitoring service (EMSC), the earthquake measured 6.4, while Turkey's Kandilli Observatory said the earthquake measured 5.6.

The quake, which was at a shallow depth of 10 kilometres, hit 8km south of the town of Acipayam, said the EMSC.

Additionally, two other 4.8 and 4.5-magnitude tremors hit the province early on Wednesday. The quakes were felt throughout the Aegean region and south of the Marmara Sea.

Denizli's governor said no casualties had been reported.