乌什台地倾斜资料的小波分析研究
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摘要
结合乌什台地倾斜开始观测以来的震例,利用基于小波分析的多尺度分析原理对乌什台地倾斜的日均值观测序列进行了分析,总结了乌什台地倾斜多尺度分析结果的映震特征。乌什台地倾斜多尺度分析结果在绝大多数地震前存在超阈值异常且具有较好的重复性,即一般都是在异常结束后几个月之内发生地震,个别情况下地震会发生在高值异常持续时段内。初步可以认定,利用基于小波变换的多尺度分析原理将地倾斜资料分解成若干频段后,能够较好地识别和提取地倾斜原始测值中不易分辨的中短期地震异常信息。
The multi-scale analysis method based on BWT was used to analyze the daily mean of tilt data at Wushi station,combining with some cases since Wushi tilt started to be observed.And we summarized the characteristics of reflecting earthquakes of multi-scale analysis results about the Wushi tilt.Most anomalies of seismic prognostic in Wushi tilt are above-threshold ones,and have some relatively good repeatability.That is,the earthquake often occurred within several months after anomalies with high value ended.However,individual earthquakes occurred in the process of high value anomaly.According to the preliminary analysis,we thought,after we separated the data of tilt into several parts with different frequency,the multi-scale analysis method based on BWT is able to identify and extract very well some anomalies of not easily to identify in the raw data of tilt before the earthquake.
The multi-scale analysis method based on BWT was used to analyze the daily mean of tilt data at Wushi station,combining with some cases since Wushi tilt started to be observed.And we summarized the characteristics of reflecting earthquakes of multi-scale analysis results about the Wushi tilt.Most anomalies of seismic prognostic in Wushi tilt are above-threshold ones,and have some relatively good repeatability.That is,the earthquake often occurred within several months after anomalies with high value ended.However,individual earthquakes occurred in the process of high value anomaly.According to the preliminary analysis,we thought,after we separated the data of tilt into several parts with different frequency,the multi-scale analysis method based on BWT is able to identify and extract very well some anomalies of not easily to identify in the raw data of tilt before the earthquake.
引文
[1]严尊国,陈俊华,钱家栋,等.二进小波变换在地震前兆信号分解中的应用[J].地震,2000(增刊):76~80.
[2][美]崔锦泰,程正兴译.小波分析导论[M].西安:西安交通大学出版社,1995.
[3]胡昌华,张军波,等.基于Mat lab的系统分析与设计—小波分析[M].西安:西安电子科技大学出版社,1999.
[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]刘希强,周惠兰,郑治真,等.基于小波变换的信号突变检测、滤波和瞬态谱研究[J].国际地震动态,1998,(1):1~8.
[6]杨又陵,徐道尊,温和平.新疆天山地区定点形变中短期地震前兆预报方法及效能评价研究[J].内陆地震,1999,13(4):314~324.
[7]Avijit Chakraborty and David Okaya.Frequency-time decomposition of seismic data using wavelet-basedmethods[J].Geophysics.1995,60(6):1906~1916.
[8]Xin-Gong Li,Mauricio D.Sacchi,and Tadeusz J.Ulrych.Wavelet transform inversion with prior scale informa-tion[J].Geophysics,1996,61(5):1379~1385.
[9]孙甲宁,夏爱国,高小其,等.乌鲁木齐10号泉流量变化的多尺度小波分析和异常识别[J].内陆地震,2003,17(4):317~325.
[2][美]崔锦泰,程正兴译.小波分析导论[M].西安:西安交通大学出版社,1995.
[3]胡昌华,张军波,等.基于Mat lab的系统分析与设计—小波分析[M].西安:西安电子科技大学出版社,1999.
[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]刘希强,周惠兰,郑治真,等.基于小波变换的信号突变检测、滤波和瞬态谱研究[J].国际地震动态,1998,(1):1~8.
[6]杨又陵,徐道尊,温和平.新疆天山地区定点形变中短期地震前兆预报方法及效能评价研究[J].内陆地震,1999,13(4):314~324.
[7]Avijit Chakraborty and David Okaya.Frequency-time decomposition of seismic data using wavelet-basedmethods[J].Geophysics.1995,60(6):1906~1916.
[8]Xin-Gong Li,Mauricio D.Sacchi,and Tadeusz J.Ulrych.Wavelet transform inversion with prior scale informa-tion[J].Geophysics,1996,61(5):1379~1385.
[9]孙甲宁,夏爱国,高小其,等.乌鲁木齐10号泉流量变化的多尺度小波分析和异常识别[J].内陆地震,2003,17(4):317~325.
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