An alternative regularization approach for modeling the regional lithospheric magnetic field from satellite magnetic measurements by the spherical equivalent source method and its application in Africa
The equivalent source (ES) method in the spherical coordinate system has been widely applied to processing, reduction, field modeling, and geophysical and geological interpretation of satellite magnetic anomaly data. However, the inversion for the ES model suffers from nonuniqueness and instability,...
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| Format: | Article |
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Science Press
2025-05-01
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| Series: | Earth and Planetary Physics |
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| Online Access: | http://www.eppcgs.org/article/doi/10.26464/epp2025066?pageType=en |
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| author | JiangSong Gui JinSong Du Pan Zhang ChangQing Yuan YuKun Li KangAn Zhao Liang Yin HouPu Li |
| author_facet | JiangSong Gui JinSong Du Pan Zhang ChangQing Yuan YuKun Li KangAn Zhao Liang Yin HouPu Li |
| author_sort | JiangSong Gui |
| collection | DOAJ |
| description | The equivalent source (ES) method in the spherical coordinate system has been widely applied to processing, reduction, field modeling, and geophysical and geological interpretation of satellite magnetic anomaly data. However, the inversion for the ES model suffers from nonuniqueness and instability, which remain unresolved. To mitigate these issues, we introduce both the minimum and flattest models into the model objective function as an alternative regularization approach in the spherical ES method. We first present the methods, then analyze the accuracy of forward calculation and test the proposed ES method in this study by using synthetic data. The experimental results from simulation data indicate that our proposed regularization effectively suppresses the Backus effect and mitigates inversion instability in the low-latitude region. Finally, we apply the proposed method to magnetic anomaly data from China Seismo-Electromagnetic Satellite-1 (CSES-1) and Macau Science Satellite-1 (MSS-1) magnetic measurements over Africa by constructing an ES model of the large-scale lithospheric magnetic field. Compared with existing global lithospheric magnetic field models, our ES model demonstrates good consistency at high altitudes and predicts more stable fields at low altitudes. Furthermore, we derive the reduction to the pole (RTP) magnetic anomaly fields and the apparent susceptibility contrast distribution based on the ES model. The latter correlates well with the regional tectonic framework in Africa and surroundings. |
| format | Article |
| id | doaj-art-d616d524f7c94be4b4f0fa7c7ed5f9eb |
| institution | Kabale University |
| issn | 2096-3955 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Science Press |
| record_format | Article |
| series | Earth and Planetary Physics |
| spelling | doaj-art-d616d524f7c94be4b4f0fa7c7ed5f9eb2025-08-20T03:53:39ZengScience PressEarth and Planetary Physics2096-39552025-05-019369771010.26464/epp2025066S22581-guijiangsong-dujinsong-FAn alternative regularization approach for modeling the regional lithospheric magnetic field from satellite magnetic measurements by the spherical equivalent source method and its application in AfricaJiangSong Gui0JinSong Du1Pan Zhang2ChangQing Yuan3YuKun Li4KangAn Zhao5Liang Yin6HouPu Li7Hubei Subsurface Multi-scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, ChinaHubei Subsurface Multi-scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, ChinaHubei Subsurface Multi-scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, ChinaHubei Subsurface Multi-scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, ChinaHubei Subsurface Multi-scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, ChinaHubei Subsurface Multi-scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, ChinaMacau Institute of Space Technology and Application, Macau University of Science and Technology, Macao 999078, ChinaCollege of Electrical Engineering, Naval University of Engineering, Wuhan 430033, ChinaThe equivalent source (ES) method in the spherical coordinate system has been widely applied to processing, reduction, field modeling, and geophysical and geological interpretation of satellite magnetic anomaly data. However, the inversion for the ES model suffers from nonuniqueness and instability, which remain unresolved. To mitigate these issues, we introduce both the minimum and flattest models into the model objective function as an alternative regularization approach in the spherical ES method. We first present the methods, then analyze the accuracy of forward calculation and test the proposed ES method in this study by using synthetic data. The experimental results from simulation data indicate that our proposed regularization effectively suppresses the Backus effect and mitigates inversion instability in the low-latitude region. Finally, we apply the proposed method to magnetic anomaly data from China Seismo-Electromagnetic Satellite-1 (CSES-1) and Macau Science Satellite-1 (MSS-1) magnetic measurements over Africa by constructing an ES model of the large-scale lithospheric magnetic field. Compared with existing global lithospheric magnetic field models, our ES model demonstrates good consistency at high altitudes and predicts more stable fields at low altitudes. Furthermore, we derive the reduction to the pole (RTP) magnetic anomaly fields and the apparent susceptibility contrast distribution based on the ES model. The latter correlates well with the regional tectonic framework in Africa and surroundings.http://www.eppcgs.org/article/doi/10.26464/epp2025066?pageType=enregional lithospheric magnetic field modelspherical equivalent source methodsatellite magnetismafricamss-1cses-1 |
| spellingShingle | JiangSong Gui JinSong Du Pan Zhang ChangQing Yuan YuKun Li KangAn Zhao Liang Yin HouPu Li An alternative regularization approach for modeling the regional lithospheric magnetic field from satellite magnetic measurements by the spherical equivalent source method and its application in Africa Earth and Planetary Physics regional lithospheric magnetic field model spherical equivalent source method satellite magnetism africa mss-1 cses-1 |
| title | An alternative regularization approach for modeling the regional lithospheric magnetic field from satellite magnetic measurements by the spherical equivalent source method and its application in Africa |
| title_full | An alternative regularization approach for modeling the regional lithospheric magnetic field from satellite magnetic measurements by the spherical equivalent source method and its application in Africa |
| title_fullStr | An alternative regularization approach for modeling the regional lithospheric magnetic field from satellite magnetic measurements by the spherical equivalent source method and its application in Africa |
| title_full_unstemmed | An alternative regularization approach for modeling the regional lithospheric magnetic field from satellite magnetic measurements by the spherical equivalent source method and its application in Africa |
| title_short | An alternative regularization approach for modeling the regional lithospheric magnetic field from satellite magnetic measurements by the spherical equivalent source method and its application in Africa |
| title_sort | alternative regularization approach for modeling the regional lithospheric magnetic field from satellite magnetic measurements by the spherical equivalent source method and its application in africa |
| topic | regional lithospheric magnetic field model spherical equivalent source method satellite magnetism africa mss-1 cses-1 |
| url | http://www.eppcgs.org/article/doi/10.26464/epp2025066?pageType=en |
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