AUTHOR=Wang Yu , Qu Junhao , Chen Tingting , Zhou Shaohui , Li Yajun TITLE=Studies of three dimensional stagged-grid finite difference for Z-axis tipper electromagnetic numerical simulation JOURNAL=Frontiers in Earth Science VOLUME=13 YEAR=2025 URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2025.1496312 DOI=10.3389/feart.2025.1496312 ISSN=2296-6463