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Transforming Total‐Field Magnetic Anomalies Into Three Components Using Dual‐Layer Equivalent Sources
Author(s) -
Li Duan,
Liang Qing,
Du Jinsong,
Sun Shida,
Zhang Yi,
Chen Chao
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl084607
Subject(s) - inversion (geology) , dual layer , layer (electronics) , magnetic field , matrix (chemical analysis) , field (mathematics) , algorithm , computer science , materials science , geology , physics , mathematics , paleontology , quantum mechanics , pure mathematics , composite material , structural basin
The equivalent source is a simple and effective method to level and manipulate magnetic data. However, large misfits between the predicted and synthetic data for different components of the magnetic field are observed when a single layer equivalent source is used. Therefore, a dual‐layer equivalent sources method, based on a shallow‐layer and an additional deep‐layer is proposed. This technique successfully overcomes the inherent problem of inversion that equivalent property concentrates in the shallow layer, by changing the dimensions of deep equivalent cells, and by using a preconditioned matrix based on a weighted function, which enhances the effects of the deep layer. The results indicate that, by adding a deep equivalent‐source layer, this new method significantly improves the accuracy in the prediction of the three components of the magnetic field, especially for the long‐wavelength fields.