Dynamic analysis of well water level tides in Qujing well,Yunnanprovince

Based on tidal theory of well-aquifer system and combined with the actual observation situation of water level in Qujing well,Yunnanprovince, the tidal amplitude ratios, phases and calculation error of 5 tidal waves for M2, S2, O1, S1K1 and M3 were calculated separately with the method provided by Baytap-G. After analyzing the dynamic characteristics of amplitude ratios and phases for different water level tidal waves, we suggest that the tidal amplitude ratios and phases, which can reflect aquifer parameters, are correlated with the near pumping and coseismic response caused by distant great earthquake. Specifically, the decrease of amplitude ratios and phases in November 2001 and August 2003 may be related to pumping. Several times of smallamplitude rise and slow recovery process of well water level tide amplitudes and phases after large earthquakes may be related to the increasing of aquifer permeability induced by the passage of seismic waves from far large earthquakes.