| 摘要: |
| 首先,对2017年中国地磁台网中心的39个地面绝对观测数据进行预处理，综合考虑了主磁场、主磁场的长期变化场、电离层磁场及磁层磁场对岩石圈磁场的影响，并进行剔除。在建模过程中，补充EMM2017模型的岩石圈磁场值以控制边界效应问题。最后，通过球冠谐分析建立了中国地区岩石圈磁场模型。研究结果表明， X分量在中国大部分地区呈东西横向分布，正负磁异常相间；而Y分量基本呈南北纵向分布。F分量与Z分量比较相似，在塔里木盆地、四川盆地附近存在高值磁异常，在青藏高原南部存在东西向的低值磁异常。 |
| 关键词: 球冠谐分析 岩石圈磁场 EMM2017模型 国际地磁参考场模型 CHAOS模型 |
| DOI： |
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| 基金项目:国家自然科学基金（42374092）；中国地震局地球物理研究所基本科研业务专项（DQJB23X15）；国家重点研发计划（2023YFC3007404） |
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| Lithospheric magnetic field modeling in China based on EMM2017 and surface vector data |
| YANG Linqing,ZHAO Xudong |
| (Institute of Geophysics, China Earthquake Administration, Beijing 100081, China; Center of Geomagnetic Network of China, Beijing 100081, China) |
| Abstract: |
| The absolute observation data of 39 geomagnetic observatories in the Geomagnetic Network of China in 2017 are pre-processed. The effects of the main magnetic field, secular variation field, ionospheric magnetic field and magnetospheric magnetic field on the lithospheric magnetic field are considered and removed. During the modeling process, the lithospheric values from the enhanced magnetic model 2017 (EMM2017) are replenished to control the boundary effect problem. Finally, the lithospheric magnetic field model of China is generated by the spherical cap harmonic model. The results show that the X component has an east-west horizontal distribution with positive and negative magnetic anomalies alternating in China, while the Y component has a north-south vertical distribution. The F component is similar to the Z component, with high-value magnetic anomalies in the Tarim Basin and Sichuan Basin, and east-west distributed low-value magnetic anomalies in the south of the Tibetan Plateau. |
| Key words: Spherical cap harmonic analysis Lithospheric magnetic field Enhanced magnetic model 2017(EMM2017) International geomagnetic reference field(IGRF) model CHAOS model |
