In this study, we have used a practical method to obtain the possible depth of a structure from gravity field anomalies of 2-D and 3-D bodies. The given geometrical model gravity anomalies have been calculated for several depths and structure sizes. Gravity anomalies of the rectangular prism for 2-D structures and the vertical cylinder for 3-D structures have been calculated for different structure sizes. The parameters which will be used in nomogram evaluation have been obtained by examining the depths and sizes of model structures with the assistance of critical point values obtained from these anomalies (gmax, X1/2, X3/4). The given nomograms could be easily used for the calculation of the possible structure depth and sizes for the acquired field gravity anomaly. In this study we have applied the method to the gravity anomaly map of Kentalan-Reşan region in Siirt, and the study results is in a good harmony with the previous studies
