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对北京地区超采引起的地下水位动态特征与成因作了详细分析,并对超采背景下如何提取地震前兆异常信息的问题作了探讨.北京地区地下水位年动态的主要影响因素是地下水开采和降雨,而地下水位动态的趋势变化则与区域地下水超采量有直接关系.本文用相关分析的方法,分析了北京平原区超采量与水位变化之间的关系,为评价超采区观测井的干扰影响程度、识别地震前兆信息提供依据.研究结果表明,在区域超采不严重的地区引起的水位趋势性变化中,也包含着地震前兆信息;采用消除趋势及年变化影响的数学处理方法,可提取出地震的趋势异常变化.
The dynamic characteristics and causes of groundwater level caused by over mining in Beijing area are analyzed in detail, and how to extract the information of earthquake precursors under over-mining is discussed.The main influencing factors of groundwater table in Beijing are the groundwater exploitation and Rainfall, and the dynamic trend of the groundwater level is directly related to the over-exploitation of groundwater.In this paper, the correlation between the over-extraction and water level changes in the Beijing Plain is analyzed by correlation analysis method, , And provide the basis for identifying the precursory information of the earthquake.The results show that the information of earthquake precursors is also included in the change of the water level induced in the area where the overexpression of the area is not serious.Mathematical treatment to eliminate the influence of the trend and the change of the year , We can extract the abnormal change of the earthquake trend.