Application of Wavelet Decomposition to Removing Barometric and Tidal Response in Borehole Water Level  

作　　者：Yan Rui Huang Fuqiong Chen Yong 

机构地区：[1]China Earthquake Networks Center, Beijing 100045, China [2]Institute of Earthquake Science, Beijing 100036, China [3]Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

出　　处：《Earthquake Research in China》2007年第4期455-462,共8页中国地震研究（英文版）

基　　金：The research was jointly supported by National NatureScience Foundation of China (40374019);the research subject entitled"Research on the Digital Data Analysis and Application of Underground Fluid" under the 11th Five-Year Program of China Earthquake Administration(2006BAC01B02-03-02)

摘　　要：Wavelet decomposition is used to analyze barometric fluctuation and earth tidal response in borehole water level changes. We apply wavelet analysis method to the decomposition of barometric fluctuation and earth tidal response into several temporal series in different frequency ranges. Barometric and tidal coefficients in different frequency ranges are computed with least squares method to remove barometric and tidal response. Comparing this method with general linear regression analysis method, we find wavelet analysis method can efficiently remove barometric and earth tidal response in borehole water level. Wavelet analysis method is based on wave theory and vibration theories. It not only considers the frequency characteristic of the observed data but also the temporal characteristic, and it can get barometric and tidal coefficients in different frequency ranges. This method has definite physical meaning.Wavelet decomposition is used to analyze barometric fluctuation and earth tidal response in borehole water level changes. We apply wavelet analysis method to the decomposition of barometric fluctuation and earth tidal response into several temporal series in different frequency ranges. Barometric and tidal coefficients in different frequency ranges are computed with least squares method to remove barometric and tidal response. Comparing this method with general linear regression analysis method, we find wavelet analysis method can efficiently remove barometric and earth tidal response in borehole water level. Wavelet analysis method is based on wave theory and vibration theories. It not only considers the frequency characteristic of the observed data but also the temporal characteristic, and it can get barometric and tidal coefficients in different frequency ranges. This method has definite physical meaning.

关 键 词：Wavelet decomposition Least squares method Earth-tide coefficients Barometric coefficients 

分 类 号：P3[天文地球—地球物理学]