The gravity data used in this study were taken from the Earth Gravity Model (EGM08) to investigate the crustal structure in the mid-Black arc region. In this study, geological structure boundaries that offer differences in density were tried to determine in the mid-Black arc region. For this purpose, the possible geological structure limits at the basement levels were especially focused on. For this reason, horizontal gradient and tilt angle techniques were practiced to find possible geological structure limits using first vertical derivative data of the regional gravity data of the region. The soft-hard sediment, basement, Conrad and Moho interfaces have been determined using the radial mean amplitude spectrum of Bouguer data of study region. The topographies of these interfaces were also presented utilizing the Parker-Oldenburg algorithm. Depth values found by inversion calculations for soft-hard sediment, basement, Conrad and Moho interface topographies are changed as 0.7-3.5, 2.1-7.4, 9.1-14.2, and 35.1- 42.5 km, respectively. The linearities determined in the study were matched against to substantial faults of region. It has been observed that there is a qualitative relationship between the faults, ore deposit and earthquake epicenters in the region. The results of this practice were based on studies such as exploring the ore deposits and investigating the risks of earthquakes in the future.