In this study, a method which sets the limits of geologic structures are used as a steerable filter. Generally used for edge detection in 2-D images steerable filters, band pass filters with some aspects and features are applied in many image processing tasks. We first steerable filters have tested on synthetic data. Then steerable filters gravity anomaly map of the Marmara region have applied to. 've Achieved using steerable filters from the map of the Marmara region, we tried to determine the tectonic line.