Two Opposite Change Patterns Before Small Earthquakes Based on Consecutive Measurements of Hydrogen and Oxygen Isotopes at Two Seismic Monitoring Sites in Northern Beijing, China by Yuxuan Chen, Fuqiong Huang, Leyin Hu, Zhiguo Wang, Mingbo Yang, Peixue Hua, Xiaoru Sun, Shijun Zhu, Yanan Zhang, Xiaodong Wu, Zhihui Wang, Lvqing Xu, Kongyan Han, Bowen Cui, Hongyan Dong, Boxiu Fei, Yonggang Zhou

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