基于小波分析的闽台地区地震形变异常研究

Study on the Deformation Anomaly of Earthquakes in Fujian-Taiwan Region Based on Wavelet Analysis

在孕震过程的不同阶段,可能会有长、中、短期前兆异常表现。为揭示闽台地区几次中强地震前不同时期的异常形态,对福建省数字化形变观测资料日均值、整点值和分钟值时序数据进行小波分析,结果发现：在强震前2~3年出现周期2年左右的异常信号;在中强地震前2~5个月出现周期1个月左右的异常信号;在震前几天至十几天则出现周期半小时至1小时的异常信号。

In the different stages of seismogenic process,there may be a long,medium and short-term precursor abnormalities.In order to reveal the form of anomaly in different periods before moderate-strong earthquakes in Fujian-Taiwan Region,we made wavelet analysis on the digital deformation observation data in Fujian province with the daily mean,hourly and minutely values.The result shows that： the abnormal signals with about 2 years period appeared in 2 to 3 years before a strong earthquake,the abnormal signals with about 1 month period appeared in 2 to 5 months before moderate-strong earthquakes,the abnormal signals with the period of half an hour to 1 hour appeared in several days to more than ten days before earthquakes.