Abstract: In this paper, the authors have analyzed the data of base line measurement across faults and studied the characteristics of fault horizontal anomalous movement before and after Tang shan, Datong and Zhangbei earthquakes. The results show that there is remarkable horizontal anomalous movement before earthquakes inepicentral region and itsperiphery. Monitoring horizontal movement of fault is an efficient approach for earthquake prediction. The horizontal anomalous movement of fault has similar characteristics at the same station before earthquakes. The horizontal anomalous movement of fault has the advanced movement quality before Tang shan earthquake around its epicenter.

Key words: Fault horizontal, Horizontal anomalous movement, Seismic precursor, North China