Estimating the Magnetization Direction of Sources through Correlation between Reduced-to-Pole Anomaly and Normalized Source Strength

Abstract

Under the effects of remanent magnetization, total magnetization direction is different from geomagnetic field direction, which makes magnetic data processing and interpretation complexity. In this paper, we present a new approach for estimating the total magnetization direction of sources via cross-correlation between the reduced-to-pole anomaly and the normalized source strength (who is less sensitive to remanent magnetization). The geomagnetic field direction is used to calculated the normalized source strength, while various assumed total magnetization directions are used to calculated the RTP anomalies. The maximum correlation between the RTP anomalies and the normalized corresponds to the estimated total magnetization direction. Test on synthetic data showed that the new approach is simple and effective.

Determination of the magnetization direction via correlation between reduced‐to‐the‐pole magnetic anomalies and total gradient of the magnetic potential with vertical magnetization

“…This approach, known as the crosscorrelation method, determines the magnetization direction that yields the maximum symmetry between two centredover-the-source transforms calculated in a series of tentative magnetization directions. Various combinations of transforms have been explored in cross-correlation methods, such as TG and vertical derivative of RTP transformation (Dannemiller & Li, 2006), RTP transformation and magnetic magnitude transform (Chen et al, 2017;Gerovska et al, 2009), normalized source strength (NSS) (Guo et al, 2014;Li et al, 2017), and the vertical derivative of NSS (Zhang et al, 2018). Jian et al (2022) extend the cross-correlation method to multiple-correlation method by compare the symmetry between RTP anomaly and multiple centred-over-the-source magnitude transforms.…”