Final 2-D electrical resistivity models obtained from inversion of TM mode data for P1 (a) and P2 (b) profiles. Inverted triangles show site locations, red arrows indicate possible branches of the NAF, white circles represent microseismic activity from 2007 to 2010 (Bulut, GFZ) in and around the ÇB. Black line beneath the basins indicates depth of the fixed sediment in modelling. The white and grey dashed lines indicate the upper crust–lower crust boundary (brittle-ductile transition zone) and Moho depth (Laigle et al.2008; Becel et al. 2010).