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Regional Modeling of the Lithospheric Magnetic Field from Local and Satellite Constraints: A Case Study of the Xinjiang Region

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Abstract

We investigate the total intensity F of the lithospheric field over the Xinjiang region (34–50° N, 73–96.5° E) through a three-dimensional surface spline (3DSS) model with 0.1° × 0.1° resolution, constrained by 296 ground measuring points recorded between 1936.0 and 2000.0, 10,236 aeromagnetic data points during 1970–2011, and 10,236 satellite model predictions of CHAOS-7.5. We compare predictions of the new model against those from the regional spherical harmonic (RSH) model, two-dimensional surface spline and Taylor polynomial models, and global models LCS-1 and NGDC720. We select 13,605, 18,723, and 23,841 points from three altitudes to create 3DSSS (sparse), 3DSSM (middle), 3DSSD (dense) models, allowing for external field contamination and boundary effects. Results show a good agreement between the spatially detailed 3DSS model and aeromagnetic data. The new model reveals lower error after inspecting the residuals and root mean square error (RMSE), the coefficients, and correlation coefficients between 3DSS models. The new model enables useful geological interpretation; four magnetic anomalies of Xinjiang are coincident with geological structures, and anomalies are also consistent with the tectonic facies and especially the geological distribution in eastern Tianshan. The lithospheric magnetic field in the research area reflects the magnetization difference of the basement, and its geological origin is ascribed to multi-stage magmatism. Results imply that the 3DSS model can model the spatial distributions robustly and is not sensitive to the number of modeling points. The induced field dominates the continent and has a magnetization process in the WE direction in Xinjiang.

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Data Availability

CHAOS-7.5 of CHAOS7 is available at http://www.spacecenter.dk/files/magnetic-models/CHAOS-7/, LCS-1 is available at http://www.spacecenter.dk/files/magnetic-models/LCS-1/ and NGDC720 is available at https://geomag.us/models/ngdc720.html. All measuring data will be available upon request.

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Acknowledgements

We acknowledge the support of the National Natural Science Foundation of China (Nos. 42250103, 41974073, 41404053), the Macau Foundation and the pre-research project of Civil Aerospace Technologies (Nos. D020308 and D020303), which is funded by China’s National Space Administration, the opening fund of the State Key Laboratory of Lunar and Planetary Sciences (Macau University of Science and Technology, Macau FDCT No. 119/2017/A3), the Specialized Research Fund for State Key Laboratories, and the NUIST-UoR International Research Institute. We also thank the reviewers for their valuable advice.

Funding

National Natural Science Foundation of China, 41974073, Yan Feng, 42250103, Yan Feng.

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Authors and Affiliations

  1. Institute of Space Weather, School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing, 210044, China

    Yan Feng, Jiaxuan Zhang, JinYuan Zhang & Yijun Li

  2. State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing, 100190, China

    Yan Feng & Ya Huang

  3. State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Taipa, 999078, Macau, China

    Yan Feng, Jiaming Ou & Shuang Liu

  4. NUIST Reading Academy, Nanjing, 210044, China

    Yan Feng

  5. China Aero Geophysical Survey and Remote Sensing Center for Natural Resource, Beijing, 100083, China

    Shengqing Xiong

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  1. Yan Feng
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Feng, Y., Zhang, J., Xiong, S. et al. Regional Modeling of the Lithospheric Magnetic Field from Local and Satellite Constraints: A Case Study of the Xinjiang Region. Pure Appl. Geophys. 180, 4219–4235 (2023). https://doi.org/10.1007/s00024-023-03385-w

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