福建省数字化形变资料的异常分析

Anomaly Analysis of Digital Deformation Data in Fujian Province

为了提取中短期地震前兆信息,对福建省2006～2008年数字化形变观测整点值资料进行了二进小波多分辨率分析,结果表明:小波分析结果的细节部分dn主要包含周期为2n～2n+1小时的信号,而近似部分an包含所有周期大于2n+1小时的信号;在此期间,福建省及其邻近地区的中强地震发生前,多数形变观测台站或测项同步接收到了周期大约为21～43 d幅度较大的异常信号,这些信号可能是地震前兆。

In order to extract medium-short term earthquake precursor information, we analyzed the hourly digital deformation data in Fujian province from 2006 to 2008 using the binary multiresolution wavelet analysis method. The result shows that： （1） the detailed components dn mainly contain signals with periods of 2n--2n＋1 hours and their approximations an contain signals with periods of more than 2n＋1 hours; （2） within this study period, the majority of stations or measuring items synchronously received abnormal signals with periods of about 21-43 days before moderatestrong earthquakes in Fujian province and its vicinity. These abnormal signals are possible earthquake precursors.