摘要
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.
This paper quantitatively analyzed the dynamic variation of groundwater-table in Beijing induced by water overdraw and the contributing factors of such variation, and discussed how to extract earthquake precursor information on the background of water overdraw. The main factors affecting dynamic groundwater-table variation in Beijing region are groundwater drawing and rainfall, and the tendencious variation of the groundwater-table is directly related to the groundwater overdraw. Using regression analysis, this paper quantified the relation between the water overdraw and groundwater-table variation, providing a basis for realizing groundwater-table variation trend and evaluating the degree of water overdraw at the observation wells in water-overdraw region. Our research result indicates that, in the region where groundwater overdraw is not severe, the earthquake precursor information can still be extracted from the ob- servation of tendencious variation of the groundwater-table. Using mathematical treatment to remove the tendencious and annual periodic variation, we are able to identify trend variation of earthquake precursory anomaly.
出处
《地震学报》
CSCD
北大核心
2009年第3期282-289,356,共8页
Acta Seismologica Sinica
基金
中国地震局2009年度震情跟踪合同制定向工作任务(200902090)资助
关键词
地下水位动态
地下水超采
相关分析
地震前兆异常
dynamic groundwater-table variation
groundwater overdraw
regression analysis
earthquake precursory anomaly
