AUTHOR=Han Mei , Guo Lianghui , Wang Yun , Wang Xiang 

TITLE=Continuous underground observation of the geomagnetic field in Xuzhou City, North China, and its time-varying characteristics

JOURNAL=Frontiers in Earth Science

VOLUME=12

YEAR=2025

URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2024.1505187

DOI=10.3389/feart.2024.1505187

ISSN=2296-6463