Temporal-spatial Evolution Characteristics of Trend Turning Data of Underground Fluid in the Great North China Area

We select out continue and relatively stable underground fluid data that has trend turning in great North China Area to analyze its changing characteristics.According to the turning point and form, we find out the temporal-spatial characteristics and then put forward a quantitative method for tread turning analysis. The results show that the fluid trend turning changes increased rapidly in the great North China Area in 2006 and 2011, this phenomenon may be related to with the 2006 Wen'an M_S5.1 earthquake and the 2011 Japan M_W9.0 earthquake respectively.