Abstract: Synthetically using GPS velocity field of China tectonic environment monitoring network in the period of 1999—2013 and a profile with 10 continuous GPS observation stations across the Liupanshan fault, this paper studies the interseismic locking characteristics and the spatial distribution of slip deficit rate of the Liupanshan fault based on block-dislocation model. The results show that the interseismic locking of the Liupanshan fault has obvious segmentation characteristics: the southern segment of the fault has the strongest degree of locking and the biggest average value of slip deficit rate, so its seismic hazard is highest. Although the northern segment of the fault has weaker locking degree than the southern segment, its average value of slip deficit rate of the shallow part of the fault is the biggest in the three segments. It is proved that the strain accumulation speed of the northern section is fast and it also has some possibility of earthquake occurrence. Both the locking degree and the slip deficit rate of the middle segment are small, so it has lower ability of earthquake occurrence than the southern segment and northern segment of the Liupanshan fault.

Key words: Interseismic locking, GPS observation, Block-dislocation model, Slip deficit rate