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| 引用本文： | 周龙寿,邱泽华,唐磊.??8.0???????????????????[J].大地测量与地球动力学,2009,29(2):24-28. |
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| 作者姓名： | 周龙寿 邱泽华 唐磊 |
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| 作者单位： | 中国地震局地壳应力研究所,北京,100085 |
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| 基金项目： | 中央级公益性科研院所基本科研业务专项 |
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| 摘 要： | ??????8.0?????????????Χ16?????????????????????????????????????м??顣????????????????128???????峱?????????????????????????????С???任??????2??128??????????6???????ν??з???????????С???任???????????????е?????仯?????????С???任???????????????????????????á????????????????????С???????????????????????????????????????е???????б??????????ó?????????????????????????????15????????????????????????
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| 关 键 词： | ??8.0?????? ????????????? ????? С???任 ????????? |
STATISTICAL TEST OF PRECURSORY WAVES BEFORE WENCHUAN Ms8.0 EARTHQUAKE |
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| Zhou Longshou,Qiu Zehua,Tang Lei.STATISTICAL TEST OF PRECURSORY WAVES BEFORE WENCHUAN Ms8.0 EARTHQUAKE[J].Journal of Geodesy and Geodynamics,2009,29(2):24-28. |
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| Authors: | Zhou Longshou Qiu Zehua Tang Lei |
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| Institution: | Institute of Crustal Dynamics;CEA;Beijing 100085 |
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| Abstract: | The precursory waves before Wenchuan 8.0 earthquake are statistically tested by use of the observed strain data with the 4 component borehole strainmeters at 16 stations around the epicenter.In which, first of all, the influence of solid tide whose period is longer than 128 minutes is removed with high pass filter,and the secondly,air pressure influence is removed with linear regression method, and then the signals for 2～128 minutes are decomposed into 6 different kinds of frequency bands with wavelet transform method. The results indicat that wavelet transform can be used to identify small change existed in deformation signal. On the basis of the characteristics of precursory wave indentified by wavelet transform,and the overrun rate method will be used to test the details of wavelet decomposing,and then the regression line slope of the overrun rate time sequence of entire details will be statisticed,thus the average and standard deviation can be obtained. These data show that precursory waves can not be generally detected during 15 day before earthquake. |
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| Keywords: | Wenchuan 8 0 earthquake 4-component borehole strainmeter precursory waves wavelet transform Overrun Rate Analysis(ORA) |
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