Tilt derivative multiscale edges of magnetic data

Abstract

Structural interpretation of potential field data is important in mapping and modeling three-dimensional geologic structures. Interpretation of potential field data, however, is a difficult task with inherent ambiguity being a major problem. Recently, several new techniques have been introduced to help structural and source geometry interpretations of potential field data (e.g., Verduzco et al., 2004; Hornby et al., 1999). These methods use either straightforward calculation of derivatives of potential field anomalies or involve several calculation stages with sophisticated theoretical background.

Subsurface faults detection based on magnetic anomalies investigation: A field example at Taba protectorate, South Sinai

“…Nevertheless, processing and interpretation of the magnetic anomalies are complicated processes due to many factors such as; the dipolar nature of the magnetic field, the superposition of the multiple magnetic sources, and the presence of geological and cultural noises (Lahti and Karinen, 2010). Moreover, the shape of the magnetic anomalies depends on both direction of the induced and remanent magnetization, making the interpretation even more complicated (Pilkington and Keating, 2004).…”

“…Variety of semiautomatic filtering techniques based on the derivatives of the magnetic data has been developed for determination of the magnetic source parameters such as locations of boundaries and depths (e.g., Petar Stavrev, 2006;Furness, 2007;Khalil, 2013). Noteworthy, wavelength and wavelets filters applying discrete Fourier-transform algorithms in the wavenumber domain (Cooper and Cowan, 2006) play significant roles in the separation of the surface geology as well as deep tectonic structure (Lahti and Karinen, 2010).…”

The Wassa deposit: A poly-deformed orogenic gold system in southwest Ghana – Implications for regional exploration

“…The resulting grids were further processed to enhance high intensity magnetic bodies and structures, and to estimate their continuity at depth. Filters applied include first vertical derivative Milligan and Gunn, 1997), upward continuation, vertical integration and tilt derivative (Verduzco et al, 2004;Lahti and Karinen, 2010).…”

The horizontal boundary and top depth estimates of buried source using gravity data and their applications

“…1). Later the method has been discussed in the theoretical precision and application conditions, and was used in the interpretation of aeromagnetic data in Namibia, Tanzania and other regions (Salem and Williams, 2007;Lee et al, 2009;Lahti and Karinen, 2010;Fairhead et al, 2011). This paper firstly introduces the Tilt angle and Tilt-depth methods, then extends the derivative from the order of 1 to 2, and derived the horizontal boundaries and top depth estimates of buried sources for gravity anomaly based on the 2nd derivative.…”