Abstract
Edge detection and edge enhancement techniques play a crucial role in interpreting potential field data. There have been various edge detection applications to magnetic data in order to determine the edges of subsurface structures in geophysics. The edge detection methods comprise analytic signal, total horizontal derivative, theta angle, tilt angle. In synthetic case, two prism model used and the edge detection filters were applied on synthetic data successfully. In field study, the magnetic anomaly of Sivas-Divrigi mining area was selected because of importance of this area in terms of high-grade iron ore reserves. The mentioned method was applied on field data and the location of iron ore was revealed. As a conclusion, tilt angle and theta map methods gave a good agreement for determination of the structure location in both synthetic and field studies. In addition, tilt angle of the vertical derivative was studied both in theoretical and field applications. It was seen that residual information could be obtained in case tilt angle was taken following the vertical derivation.
Highlights
Gravity and magnetic anomalies are essential ranging from geophysical approaches to geologic mapping [1]
When previous studies conducted about the usage of those methods are investigated; Salem et al [5] evaluated the magnetic anomaly by using the derivatives of the tilt angle
Within the field studies; THDR, analytic signal (AS), tilt angle (TA) and theta map (TM) methods were applied to magnetic map depicted in Figure 5, which belongs to a iron ore deposit located in Sivas-Divrigi
Summary
Gravity and magnetic anomalies are essential ranging from geophysical approaches to geologic mapping [1]. There are various procedures that have been engaged to attain edge detection, for example, horizontal gradient method (THDR), analytic signal (AS), tilt angle (TA), theta map (TM) and etc. Cooper [8] used the analytical signal and tilt angle method in the detection of structure boundaries in aeromagnatic data. Within the scope of this study; firstly THDR, AS, TA, TM methods, which are intended to determine magnetic bodies, were employed by using synthetic models that comprise magnetic anomalies. These methods were applied to the real magnetic anomalies that exist at the mine site located in Sivas-Divrigi (Figure 1). In regards to tilt angle, the decrease on the boundaries happen to be linear whereas it comprises a sequence of maximum-minimum trend in theta map
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