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Title:: Extracting the Precursor Anomaly of Ground Fluid Using Wavelet Transform Method

Author(s):: GENG Jie; CHEN An-fang; PAN Shuang-jin; (Earthquake Administration of Shandong Province,Jinan,250014,China)

Keywords:: wavelet transform; ground fluid; precursor anomaly; high frequency; low frequency

摘要:: 首先对小波分析方法作了简单介绍,然后运用该方法,对1992～2002年上海地区9口水氡观测井的资料进行了6阶小波变换,提取的地震异常信息与实际地震有较好的对应关系; 对1983年山东荷泽5.9级地震和1998河南清丰4.0级地震前聊古1井的氡观测资料进行了小波分析,发现1～6阶小波系数均出现异常; 对1999年山东苍山5.2级地震前枣庄十里泉井的水汞观测资料进行了小波分析,发现1～6阶小波系数也出现异常。因此,运用小波分析方法可以有效地提取地震前兆异常信息。

Abstract:: We briefly introduce the wavelet transform method,and use the method to analyze the water radon data of 9 wells in Shanghai from 1992 to 2002,Liaogu Well no.1 in Shandong before the 1983 Heze,Shandong,M_L5.9 and 1998 Qingfeng,Henan,M_S4.0 earthquakes,and Shiliquan Well in Zaozhuang before the 1999 Cangshan,Shandong,M_L5.2 earthquake.In Shanghai,the anomalies extracted by using 6-order wavelet transform correspond to the earthquakes well; and the 1- to 6-order wavelet coefficients all show anomaly before the Heze,Qingfeng,and Cangshan earthquakes.Therefore,we consider that using wavelet transform method to extract seismic precursor anomaly is efficient.