福建定点和流动跨断层对台湾强震的反映及特征研究
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摘要
借助Matlab平台,应用能给出不同尺度下信号分解的近似部分和细节部分的小波变换方法,分析了福建省定点和流动跨断层场地的短水准形变观测资料。福建天马定点跨断层2003～2007年短水准观测资料的小波分析结果显示,分解到第七层的近似信号在极值和拐点出现前后往往有中强地震发生。由于福建省流动跨断层短水准测量为不定期观测,为取得等时间间隔的时序数据,我们采用三阶样条插值,在此基础上进行小波分析,发现分解到第三层的细节信号在台湾1999年"9.21"南投MS7.6级地震前有明显的年变规律被破坏的现象。
With the help of Matlab platform,short leveling deformation observation data of stationary and mobile cross -fault sites in Fujian Province are analyzed by using the wavelet transform method,which is able to provide approximations and details of signal when it is decomposed at different scale levels.The results drawn from observation data of stationary cross-faults at Tianma from 2003 to 2007 show that moderate-strong earthquakes will probably occur before or after extreme values or knee points of the seventh level approximate decomposing signal appear.Because measurements of mobile cross-faults in Fujian are made at irregular intervals,the third-order spline interpolation method was applied to obtain time sequence data at equal intervals and then wavelet analyses were conducted.It is found that the yearly-changing pattern of the third detailed decomposed signal was disturbed before the Ms7.6 earthquake on Sept.21,1999 in Nantou,Taiwan.
With the help of Matlab platform,short leveling deformation observation data of stationary and mobile cross -fault sites in Fujian Province are analyzed by using the wavelet transform method,which is able to provide approximations and details of signal when it is decomposed at different scale levels.The results drawn from observation data of stationary cross-faults at Tianma from 2003 to 2007 show that moderate-strong earthquakes will probably occur before or after extreme values or knee points of the seventh level approximate decomposing signal appear.Because measurements of mobile cross-faults in Fujian are made at irregular intervals,the third-order spline interpolation method was applied to obtain time sequence data at equal intervals and then wavelet analyses were conducted.It is found that the yearly-changing pattern of the third detailed decomposed signal was disturbed before the Ms7.6 earthquake on Sept.21,1999 in Nantou,Taiwan.
引文
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[11]张燕,吴云,刘永启,等.小波分析在地壳形变资料处理中的应用[J].地震学报,2004,26(增刊):103-109.
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[2]邵辉成,杜兴信,金学申,等.小波分析在地震趋势预测中的应用[J].中国地震,2000,16(1):48-52.
[3]邵辉成,傅征祥,王晓青,等.中国大陆西部及邻近地区地震活动的小波分析[J].中国地震,2004,20(3):257-262.
[4]敬少群,王佳卫,童迎世.小波变换在少震、弱震区地下水位数据分析中的应用[J].华南地震,2002,22(2):9-15.
[5]李杰,刘希强,李红,等.利用小波变换方法分析形变观测资料的正常背景变化特征[J].地震学报,2005,27(1):33-41.
[6]李杰,李明海,刘希强,等.利用小波变换方法分析跨断层形变异常[J].大地测量与地球动力学,2004,24(3):73-78.
[7]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.
[8]宋治平,武安绪,王梅,等.小波分析方法在形变数字化资料处理中的应用[J].大地测量与地球动力学,2003,23(4):21-27.
[9]张永志,王双绪.河西地区地壳垂直形变的小波分析结果与中强震关系研究[J].地震学报,1998,20(2):150-157.
[10]张永志,王文萍,牛安福.华北定点形变的小波分析与地震活动研究[J].地壳形变与地震,1999,19(3):48-54.
[11]张燕,吴云,刘永启,等.小波分析在地壳形变资料处理中的应用[J].地震学报,2004,26(增刊):103-109.
[12]姜健飞,胡良剑,唐俭.数值分析及其MATLAB实验[M].北京:科学出版社,2004.83-104.
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