An 5.7-magnitude earthquake shook Turkey's largest city Istanbul on Thursday.
The epicentre of the quake was about 70 kilometres west of Istanbul in the Marmara Sea, south of the town of Silivri. Witnesses said they felt buildings shake in the city during the quake.
On Tuesday, a 4.6-magnitude earthquake struck southwest of the Marmara Sea caused panic among the residents of Istanbul. No casualties were reported.
Turkey has long feared a repeat of the 1999 7.5-magnitude earthquake in the same region industrial, heavily populated region that killed over 17,000 people.
A senior researcher at Boğaziçi University Kandilli Observatory and Earthquake Research Institute said earlier this week that an earthquake with a magnitude of 6 or 7 is expected in the not too distant future in the region, Hurriyet Daily News reported.
“We cannot say when the big earthquake will happen. Small earthquakes do not take big earthquakes,” Dr Doğan Kalafat said.