2025-09-18T18:40:36.0000Z40.8586128.40757.03manualconfirmedKOERI2.1ML1Origin/20250918191030.83275.587539Magnitude/20250918191030.83281.587540KOERIMarmara Denizi - [18.46 km] Büyükçekmece (İstanbul)region name