Naizheng Liu, Tao Wang, Songlin Peng, Yongdong Li, Ji Cai, Guangyou Fang
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Parameter Estimates of Magnetic Dipole Source Using Extended Two-Dimensional Orthonormal Basis Functions
We have proposed an alternative method for calculating the six parameters (three position parameters and three magnetic moment parameters) of a magnetic dipole source using extended two-dimensional orthonormal basis functions (2D-OBFs). In this method, a 2D-OBF decomposition is performed on the total-field anomaly generated by the magnetic dipole to obtain parameters defined as energy. The horizontal position estimate of the dipole is determined by identifying the peak of the energy distribution. By using peaks corresponding to two different initial vertical distance estimates (the distance from the dipole to the observation plane), the final vertical distance estimate can be analytically calculated. The magnetic moment vector is then obtained by solving the corresponding analytical equation. Thus, all six magnetic dipole parameters can be calculated simultaneously. We comprehensively demonstrated the characteristics and effectiveness of the proposed method through testing with synthetic and field data. Additionally, we conducted a comparative analysis to evaluate the similarities and differences between the proposed method and the Euler deconvolution method in field data testing. Although the 2D-OBF method requires further practical application testing, we are confident in its potential for detecting magnetic dipole sources, particularly in providing reliable initial parameter estimates for iterative optimization inversion.
期刊介绍:
pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys.
Long running journal, founded in 1939 as Geofisica pura e applicata
Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences
Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research
Coverage extends to research topics in oceanic sciences
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