基于小波分析的闽台地区地震形变异常研究
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摘要
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 area,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.
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 area,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.
引文
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[5]飞思科技产品研发中心.MATLAB6.5辅助小波分析与应用[M].北京:电子工业出版社,2003:1-79.
[2]刘序俨,张卫华,黄声明,等.定点形变数字观测中高频信号特征及提取方法[J].大地测量与地球动力学,2006,26(增刊):5-10.
[3]张燕,吴云,刘永启,等.潮汐形变资料中地震前兆信息的识别与提取[J].大地测量与地球动力学,2003,23(4):34-39.
[4]钟继茂,陈光.福建省数字化形变资料的异常分析[J].华南地震,2009,29(3):98-103.
[5]飞思科技产品研发中心.MATLAB6.5辅助小波分析与应用[M].北京:电子工业出版社,2003:1-79.
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