Relation Between Change of GPS Long Trend and Big Earthquake

We give an analysis of 27 fiducial stations'coordinates of time series data in China since March 3,2011,which are sub-band processed through the wavelet transformation to extract a long trend items(T≥512 d) primarily.From the curve of the long trend items we can see that the stations have regional characteristics,the stations from the same region have a big correlation coefficient,and has a good coincidence with the block.When the curve has fluctuation characteristics,there always be earthquake above Ms 7.5 happened in Chinese mainland and its surroundings afterward.This phenomenon is of great significance and reference value for the medium-term(1-3 a) Earthquake prediction.