Progress and challenges in modeling global lithospheric magnetic anomalies
Luo Yao
Li Jingmin
Zheng Jinxin
Yang Xue
Yin Hang
Zhang Wenzhi
Meng Qingkui
Li Bing
Wang Linfei
Abstract：Over the past 50 years,extensive airborne and oceanic magnetic survey data collection efforts have resulted in the almost complete coverage of near-surface magnetic survey data worldwide.National and interconti-nental magnetic anomaly maps have also been generated.Advancements in satellite magnetic field measurements,such as those from CHAllenging Minisatellite Payload(CHAMP),provided longwave magnetic anomaly back-grounds on a global scale.This has led to the realization of global magnetic anomaly grids with arcminute resolu-tions,such as the World Digital Magnetic Anomaly Map(WDMAM).Utilizing these datasets,spherical harmonic coefficient models such as the NGDC-720 model have been established for lithospheric magnetic fields.The glob-al lithospheric magnetic anomaly model has progressed considerably;for example,the shortest wavelengths reflec-ted in the spatial resolution have improved from hundreds of kilometers to tens of kilometers.However,modeling still faces major challenges;for example,the accuracy of the model remains low,amounting to a few hundred nano-tesla.In this study,we provide a comprehensive review of the techniques for compiling magnetic anomalies at vari-ous scales and discuss the key methodologies for processing and compiling them.Furthermore,we address the complexities involved in modeling the global lithospheric magnetic field.Our objective was to address the short-comings of lithospheric magnetic anomaly modeling and develop a high-precision,independent,and controllable lithospheric magnetic field model for China.
Keywords：near-surface magnetic surveyssatellite magnetic measurementslithospheric magnetic fieldmag-netic anomaly mapspherical harmonic analysis
Publication Date：2024-11-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：12( 681-692 )