节点文献
地下水超采区水位长趋势动态分析
Long tendency dynamic analysis of water level in groundwater overdrafting area
【摘要】 地下水多年过量开采水位持续下降,不仅在观测资料中叠加了大量的疑似地震前兆,严重地压低了来自孕震体的信息,而且使正常的地震长、中、短周期变化背景扭曲,前兆异常更加难辨。本研究采用"线性拟合去趋势方法"对水位多年观测资料进行了分析。分析结果表明,线性拟合去趋势后水位10年左右的准周期结构清楚,能有效地排除地下水超采的影响,突出正常趋势变化背景,放大潮汐信息量,便于识别地震前兆。
【Abstract】 A great deal of doubtful data that restrict the information from seismogenic body,distort the background cycles of underground water level,superimpose observation data of underground water level,and make the earthquake precursors difficult to be distinguished.In this paper,we analyzed observation data of underground water level of many years,and removed the follow tendency by linear regression analysis.The result shows that observation data of underground water level include 10-year quasi-cycle.In this way,we can effectually remove the influence of groundwater overdraft.Secondly,we can highlight the change of the background.In addition,we can amplify tides.All of these make the earthquake precursors to be distinguished easily.
【Key words】 Groundwater overdraft area; Water level 10-year quisi-cycle; Linear regression analysis; Earthquake precursor;
- 【文献出处】 地震 ,Earthquake , 编辑部邮箱 ,2007年04期
- 【分类号】P315.723
- 【被引频次】9
- 【下载频次】146