Update 2019-09-26 (2): According to recent reports multiple people were lightly injured and some buildings were lightly damaged in the earthquake.
Update 2019-09-26 (1): The telecommunication infrastructure was disrupted after the earthquake. Schools, hospitals, and shopping centres were temporarily evacuated. A minaret collapsed due to the earthquake in Avcılar.
Aftershocks, which may cause additional damage, are possible in the region. Travellers are advised to avoid damaged buildings and bridges as well as mountainsides.
Anadolu Agency, CNN Türk
2019-09-26, Turkey: Moderate magnitude 5.7 M coastal earthquake
Earthquakes of this magnitude can cause damage to buildings and infrastructure. Transport and infrastructure disruptions are to be expected.
It is unlikely that a destructive tsunami was generated by a coastal earthquake of this magnitude.