华北定点形变的小波分析与地震活动研究

利用小波分析方法对华北地区１９９０ 年到１９９８ 年的多台定点形变观测资料进行了分析计算，并将计算结果与该地区的地震活动进行了对比分析，同时讨论了不同阶的小波分解结果的物理意义及其与地震之间的对应关系。认为小波分解本质是窗口加权滑动平均，能有效地对各种不同频率成分的形变按不同的频段分离，为识别地震形变异常提供一种新的手段。在空间分布上，地形变的变化幅度与地震活动强度相对应，即在华北西北部地震活动性较强的包头、张家口一带，台站形变的强度明显高于华北东南部地震活动性较弱的泰安、营口等地区。在时间分布上，张北ＭＬ６ ．２ 级地震前大约两年东西方向的形变振幅随时间变化明显加大。

RELATIONSHIP BETWEEN WAVELET TRANSFORM RESULTS OF STATION DEFORMATION AND SEISMICITY IN NORTH PART OF CHINA

By applying the theory and method of wavelet transform, the data of deformation stations which are measured from 1990 to 1998 in north part of China is calculated. At the same time, the seismicity from 1990 to 1998 in north part of China are compared with wavelet transform computed results of station deformation. It is discovered that the stronger the earthquakes, the greater the station deformation. On the other hand, the station deformation variation with time become greater about two years before Zhangbei M L6.2 earthquake occurred in 1996.