| 基于小波变换的动态地震活动周期分析 |
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| 引用本文： | 杜兴信.基于小波变换的动态地震活动周期分析[J].地震,1997,17(3):257-264. |
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| 作者姓名： | 杜兴信 |
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| 作者单位： | 陕西省地震局!中国西安，710068 |
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| 摘 要： | 利用Ｍｏｒｌｅｔ小波变换对华北、中国大陆和陕西的地震活动进行了动态周期分析。结果表明，地震活动既存在比较稳定的周期，也有一定时变性，如华北近５００ａ来存在比较稳定的３００ａ周期和６０ａ左右周期，陕西近２０ａ来存在比较稳定的２￣３ａ周期，中国大陆５级以上地震在１９１０￣１９８０年普遍存在３０ａ左右周期，但在１９８０年后变为２０ａ左右周期，小波分析揭示的地震活动周期时变性，一方面提示在依据周期规律外推
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| 关 键 词： | 小波变换 地震活动性 周期分析 |
WAVELET-BASED ANALYSIS OF DYNAMIC SEISMICITY PERIOD |
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| Du Xingxin.WAVELET-BASED ANALYSIS OF DYNAMIC SEISMICITY PERIOD[J].Earthquake,1997,17(3):257-264. |
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| Authors: | Du Xingxin |
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| Abstract: | The Morlet wavelet translation method has been used to analyse the dynamic Period ofseismicity in North China, China,s continent and Shanxi province. The results show thatthere exist both comparatively stable periods and some varinble periods with time. For ex-ample, in recent 500 years, some quite stable periods, 300 years or 60 years, exist inNorth China; in recent 20 years, 2 to 3 years' stable period in Shanxi; and for earthquakeswith M >5 in china's continent, there commonly exist 30 year's period from 191O to 1980,but 20 or so years' period after 1980. The period change with time of seismic activity showedby wavelet analysis indicates that one should not only use the recent period and more stableperiod to predict seismic tendency, but also pay attention to the influence of the non-pre-dictable sudden change of period on predictive effects. |
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| Keywords: | Wavelet analysis Seismic activity Period analysis Tendency prediction |
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