中国大陆西部及邻近地区地震活动的小波分析

Wavelet Analysis of Earthquake Activity in West of the Chinese Mainland and Its Adjacent Area

利用能反映非平稳信号时频域特征的小波分析方法 ,分析了百年来中国大陆西部及邻近大三角地区的地震资料 ,得到了地震活动在不同时间尺度上的特征。百年来该地区地震活动主要周期分别为 4 2年、2 2年、7年和 14年 ,而且其强度随时间在变化 ,由此我们认为对于地震活跃或平静期的讨论只有建立在具体的时间尺度上才有意义。同时利用各种尺度的小波系数和地震活动主周期对未来地震趋势进行的分析表明 。

Wavelet is a useful tool for analyzing time-frequency of non-stable series and widely applied in many fields. The preparation and occurrence of earthquake is a non-linear process, wavelet was used to analyse the series of the earthquake data for the time periods from 1900 to 2003 in west of the Chinese main land and its adjacent area, and obtained the characteristic information in different time scales. In the last 103 years, there are 4 primary periods,44, 22, 7 and 14 years, and earthquake activity changes with time. It is significant that the analysis is made on the basis of a specific time scale to discuss the active and quiet periods of earthquake activity. In addition to use the primary periods and the wavelet coefficients to analysis and discuss the trend of earthquake, several years later, earthquake activity in this region will be active.