According to data from the Disaster and Emergency Management Authority (AFAD), a magnitude 3.5 earthquake occurred in the Sea of Marmara, approximately 21 kilometers from the Büyükçekmece district.
The earthquake was recorded on April 27, 2025, at 22:43. The tremor, which occurred at a depth of 9.36 kilometers, was felt in the western parts of Istanbul and surrounding districts.

News Source: 12punto