基于等效源技术的海域地磁场建模技术研究

doi:10.11720/wtyht.2025.0126

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Abstract

To address the key issues in marine geomagnetic field modeling, this paper systematically explored the theoretical basis, modeling method, and optimization strategy of the equivalent source technology. By analyzing the geometric parameters and spatial configuration strategies of equivalent sources, a terrain-following vertical hexahedral equivalent source configuration scheme was proposed, significantly enhancing the accuracy of magnetic field models. In terms of algorithm implementation, a sliding window-based coverage calculation scheme was employed, effectively overcoming the bottleneck in the high-precision processing of massive magnetic survey data. Experimental results show that maintaining an overlap rate of 15%~20% in the sliding window ensures both boundary continuity and optimal computational performance. This method provides a reliable technical support for high-precision marine geomagnetic field modeling, with its effectiveness having been verified across various geological models (with the errors less than 5%).

Key words： equivalent source technology marine geomagnetic field modeling continued accuracy

Received: 10 April 2025 Published: 23 October 2025

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	Articles by authors
	Jun-Lu WANG
	Meng WANG
	Hui CHEN
	Xiao-Fei ZHANG
	Yuan-Man ZHENG
	Bing YU
	Hui-Zi NIE

Cite this article:

Jun-Lu WANG,Meng WANG,Hui CHEN, et al. Marine geomagnetic field modeling based on equivalent source technology[J]. Geophysical and Geochemical Exploration, 2025, 49(5): 1099-1109.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.0126 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I5/1099

Single prism model and equivalent source setting method
a—set a model that is consistent with the actual field source for equivalent sources; b—set a model that deviates from the actual field source for equivalent sources

Results of equivalent source equivalence analysis based on model 1
a—the calculation result when the equivalent source position is consistent with the actual situation; b—calculation result of moving up 1 m equivalent source; a1, b1—poor fitting of raw data; a2, b2—downward 5 m error; a3, b3—upward 5 m error; a4, b4—equivalent sources for inversion reconstruction

Magnetic geological model of the sea area

Simplified geological model of marine magnetic survey

Comparison of extension accuracy between model two dipole and prism equivalent source models

Error statistics of equivalent sources at different depths in model 2

Reconstructed data of 0 m plane with different equivalent source depths

Extension errors of different magnetization directions in the absence of remanence (a) and the presence of remanence (b)

The influence of different observation network sizes on modeling accuracy in equivalent source magnetic field modeling

The influence of different equivalent source depths on modeling accuracy

The influences of different equivalent source thicknesses on modeling accuracy

The influence of different edge expansion points on modeling accuracy

Results of traditional block method for extending the continental shelf model by 200 meters
a—downward extension theory; b—upward extension theory; c—downward simulation; d—upstream simulation

Schematic diagram of window overlay sliding window
red box—region A, extended data range; blue box—area B, observation data range; purple box—region C, equivalent source

Improved block method for extending 50 meters and 200 meters results
a—extend 50 m downwards; b—extend 50 m upwards; c—extend 200 m downwards; d—extend 200 m upwards

Comparison of maximum errors among different models

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