关键词: 水位振荡, 水温下降, 同震响应, 气体脱逸

Abstract: The observation of water temperature in deep well has been carried out for more than 20 years in China.However,the study on the mechanism of water temperature co-seismic response is inadequate at present.On December 26,2004,the great earthquake of M_S 8.7 occurred in the northwest offshore of Sumatra,Indonesia.After the shock,most of the observation wells in China recorded the coseismic response of water level and temperature.We studied the co-seismic response characteristics of water level and temperature in 121 wells and found the regular response characteristics.When the water level in a well oscillates,its water temperature will drop at the same time.The process will continue from dozens of minutes to several hours,and the process of the water temperature drop corresponds to the process of the water level oscillation.Once the water level oscillation stops,it restores to the level before the earthquake immediately.But,the water temperature rises at a slow speed and will take several hours to attain its former level.

Key words: water level oscillation, water temperature drop, co-seismic response, gas escape