基于扩展二维正交基函数的磁偶极子源参数估计

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Naizheng Liu, Tao Wang, Songlin Peng, Yongdong Li, Ji Cai, Guangyou Fang
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引用次数: 0

摘要

我们提出了一种利用扩展二维正交基函数(2d - obf)计算磁偶极子源的六个参数(三个位置参数和三个磁矩参数)的替代方法。该方法对磁偶极子产生的全场异常进行2D-OBF分解,得到定义为能量的参数。偶极子的水平位置估计是通过识别能量分布的峰值来确定的。利用两个不同的初始垂直距离估计值(偶极子到观测平面的距离)对应的峰值,可以解析计算出最终的垂直距离估计值。然后通过求解相应的解析方程得到磁矩矢量。这样,可以同时计算所有六个磁偶极子参数。通过综合数据和现场数据的测试,全面论证了该方法的特点和有效性。此外,我们还进行了对比分析,以评估所提出的方法与欧拉反卷积方法在现场数据测试中的异同。虽然2D-OBF方法需要进一步的实际应用测试,但我们对其探测磁偶极子源的潜力充满信心,特别是在为迭代优化反演提供可靠的初始参数估计方面。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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.

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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
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 See Instructions for Authors on the right hand side.
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