(a) Topography, bathymetry and active faults of western Turkey and the eastern Aegean Sea: strike-slip faults are denoted by heavy solid lines; normal faults are denoted by heavy solid lines with ticks on the downthrown block. The topography and bathymetry are contoured at 750m intervals between − 1500m and 1500m. The active faults are from Saroglu, Emre & Kuscu (1992). (b) ISC epicentres for M>4.5 earthquakes that occurred between 1963 and 1993.