Abstract: This paper presents the results of analysis of observed data of water levels from 8 observation wells, water temperature from 4 wells and soil radon from 4 well sites obtained during the year of 2001. Based on the work, the normal behaviors of each observation item are established and their responsibility to earthquake event are tested. The results indicate that all the groundwater levels from 8 wells are able to reflect the solid tide. The sensitivity of the response of groundwater to volumetric strain of the earth crust in eight wells ranges from 10^-9 to 10^-10 volumetric strain/mm. Groundwater levels in most wells within the well network have barometric effects and are influenced to some extent by the rainfall. The water temperature in 4 wells is relatively stable, the daily change of which is ranging within several degrees a thousandth. The soil radon in 4 well sites fluctuates dramatically, and the annual change ranges from ten to several tens Bq/L. The anomalies of water levels in 6 wells, water temperature in one well, and soil radon in one well site were observed before the M_L3.6 earthquake occurred at Meijiahe, Zigui County on October 16, 2001. This may indicate that the Three Gorge observation well network has a relatively high capability to respond earthquake event.

Key words: subsurface fluids, normal behaviors, seismic anomaly, Three-Gorge well network

摘要： 系统分析了三峡井网8口井水位、4口井水温和4个井台土氡2001年的观测数据,建立了各个测项的正常动态,并检验了其各自的映震能力。结果表明,8口井水位均有固体潮显示,其对地壳体应变的响应灵敏度为10^-9～10^-10体应变/mm。井水位大多有气压效应,并受一定程度的降雨干扰。4口井的水温动态相对平稳,日变幅一般为千分之几度。4个井台的土氡动态起伏较大,变化范围在几到几十Bq/L之间。在2001年10月16日秭归县梅家河M_L36地震前,有6口井水位、1口井水温和1个井台的土氡有异常显示,表明三峡井网具有较强的映震能力。

关键词: 地下流体, 正常动态, 震前异常, 三峡井网