Estimating the magnetization direction of magnetic bodies through correlation between reduced-to-the-pole anomaly and the normalized source strength

Rao, Chunfeng; Yu, Peng; Zhang, Luolei; Hu, Xueyi; Chen, Cheng

doi:10.1190/segam2016-13948717.1

Cited by 7 publications

(1 citation statement)

References 11 publications

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“…One of these transformations is related to the reduced-to-pole (RTP) anomaly, which is sensitive to the assumed magnetization directions; the other transform is related to some magnetic quantities that are weakly sensitive to the directions of the source magnetization, such as total gradient (Nabighian, 1972;Roest et al, 1992), amplitude data T a (Stavrev and Gerovska, 2000), and normalized source strength (NSS) (Wilson, 1985). Several combinations of these two types of anomalies have been published, e.g., the vertical derivative of the RTP anomaly (RTP z ) and the total gradient of the RTP anomaly (RTP xyz ) (Dannemiller and Li, 2006), the RTP anomaly and T a (Gerovska et al, 2009), and the RTP anomaly and NSS (Rao et al, 2016;Li et al, 2017). Considering that the two types of anomalies should have the same decay rates with the distance to the source (Dannemiller and , RTP z may be a better choice than RTP when combined with NSS.…”

Section: Introductionmentioning

confidence: 99%

Constrained 3D inversion of magnetic data with structural orientation and borehole lithology: A case study in the Macheng iron deposit, Hebei, China

2019

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We have developed a case study on the use of constrained inversion of magnetic data for recovering ore bodies quantitatively in the Macheng iron deposit, China. The inversion is constrained by the structural orientation and the borehole lithology in the presence of high magnetic susceptibility and strong remanent magnetization. Either the self-demagnetization effect caused by high susceptibility or strong remanent magnetization would lead to an unknown total magnetization direction. Here, we chose inversion of amplitude data that indicate low sensitivity to the direction of magnetization of the sources when constructing the underground model of effective susceptibility. To reduce the errors that arise when treating the total-field anomaly as the projection of an anomalous field vector in the direction of the geomagnetic reference field, we develop an equivalent source technique to calculate the amplitude data from the total-field anomaly. This equivalent source technique is based on the acquisition of the total-field anomaly, which uses the total-field intensity minus the magnitude of the reference field. We first design a synthetic model from a simplified real case to test the new approach, involving the amplitude data calculation and the constrained amplitude inversion. Then, we apply this approach to the real data. The results indicate that the structural orientation and borehole susceptibility bounds are compatible with each other and are able to improve the quality of the recovered model to obtain the distribution of ore bodies quantitatively and effectively.

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Section: Introductionmentioning

confidence: 99%

Constrained 3D inversion of magnetic data with structural orientation and borehole lithology: A case study in the Macheng iron deposit, Hebei, China

2019

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Recovering the total magnetization direction using a novel stable reduction to the pole filter (RTP)

Ribeiro

2020

Journal of Applied Geophysics

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A new method to estimate the total magnetization direction from the magnetic anomaly: Multiple correlation

Jian

Liu

et al. 2022

GEOPHYSICS

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Natural remanent magnetization diverts the direction of the total magnetization vector from the Earths magnetic field direction. It is important to determine the magnetization direction because the processing and inversion of magnetic data usually need the magnetization direction as a priori information. The conventional strategy for estimating the magnetization direction is to compute the cross-correlation between the reduced-to-the-pole (RTP) field and one magnetic magnitude transform which is insensitive to the magnetization direction. A new theory and method are proposed that the total magnetization direction is determined by computing the multiple correlation coefficients between the RTP field and the multiple direction-insensitive magnitudes transforms, such as the magnetic amplitude and normalized source strength. The linear regression between the RTP field and the direction-insensitive magnitude transforms is established. Then the correlation is computed by the RTP field and the constructed regressor. The proposed method is tested on synthetic data of single and complex models, respectively. Then the method is applied to the field data of the Yeshan region (eastern China) and the Black Hill Norite (southern Australia). The proposed multiple correlation is an extension of conventional cross-correlation method that provides an accurate and robust way to estimate the magnetization direction from a magnetic anomaly.

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Estimating the magnetization direction of magnetic bodies through correlation between reduced-to-the-pole anomaly and the normalized source strength

Cited by 7 publications

References 11 publications

Constrained 3D inversion of magnetic data with structural orientation and borehole lithology: A case study in the Macheng iron deposit, Hebei, China

Constrained 3D inversion of magnetic data with structural orientation and borehole lithology: A case study in the Macheng iron deposit, Hebei, China

Recovering the total magnetization direction using a novel stable reduction to the pole filter (RTP)

A new method to estimate the total magnetization direction from the magnetic anomaly: Multiple correlation

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