Abstract: In order to effectively obtain earthquake precursors of potential seismic source and state of fault strain accumulation, we analyzed the fault movements in Sichuan-Yunnan region and the Capital area of China applying the concept of fault motion coordination ratio (FCR). The results show that: ① The fault had been locked for at least ten years at the source region of M7.0 Lijiang earthquake. The different characteristics of spatial and temporal of FCR change among several surveying sites, which may reflect the evolution of abnormal changes in the seismic source and external regions. ② The nature of fault motion can be identified using parameter of FCR. Fault movement is in free and non-strain accumulation state if FCR is in normal level, even though baseline and level surveying curve showed abnormal changes. ③ Certain kind of discrete changes of FCR appear before the majority of great earthquakes, which has certain values in analyzing the nature of fault motion, strain accumulation state and long-term earthquake prediction.

Key words: Fault motion coordination ratio (FCR), Strain accumulation, Earthquake prediction