Short-term seismic precursor anomalies in hydrogen concentration at fault gas stations along the Northern Margin Fault of the Yanqing Basin of Beijing, China - Yang, Mingbo; Liu, Guiping; Chen, Yuxuan; Hua, Peixue; Hu, Leyin; Wang, Zhiguo; Wang, Shanshan; Sun, Xiaoru; Zhou, Yonggang; Zhang, Haichun; Feng, Gang; Gao, Xiang; et al. (Frontiers in Earth Science, 2025)