汶川8.0级地震前定点形变异常特征
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摘要
对汶川8.0级地震震中周围800km范围内近50个定点形变台站资料作小波变换处理,发现从震前3个月开始,30个台站资料处理结果显示有异常出现.距震中200km以内的台站,其异常信息主要集中在小波分解的细节部分第6层;距震中200—550km范围内的台站,其异常主要集中在第7层或第8层;距震中550—650km范围内的台站,其异常主要集中在第8层或第9层.表明异常信息的频率随着各台站距离震中的远近呈现由低到高的特征.
Applying wavelet transformation to processing observation data of nearly 50 permanent deformation stations, with the epicentral distance less than 800 km to epicenter of Wenchuan MS8.0 earthquake, that the abnormal signals appeared 3 months before the Wenchuan earthquake in the observation data of 30 stations. In terms of the wavelet analysis, the anomalies mainly appeared on the sixth level at the stations within 200 km from the earthquake, on the seventh or eighth level at stations between 200 km to 550 km , and on the eighth or ninth level of detailed part when stations are in the range of 550 km to 650 km from the epicenter. That is to say, the nearer the stations are from the earthquake epicenter, the higher the frequency of anomalies.
Applying wavelet transformation to processing observation data of nearly 50 permanent deformation stations, with the epicentral distance less than 800 km to epicenter of Wenchuan MS8.0 earthquake, that the abnormal signals appeared 3 months before the Wenchuan earthquake in the observation data of 30 stations. In terms of the wavelet analysis, the anomalies mainly appeared on the sixth level at the stations within 200 km from the earthquake, on the seventh or eighth level at stations between 200 km to 550 km , and on the eighth or ninth level of detailed part when stations are in the range of 550 km to 650 km from the epicenter. That is to say, the nearer the stations are from the earthquake epicenter, the higher the frequency of anomalies.
引文
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Bruce A,Donoho D,Gao H Y.1996.Wavelet analysis[J].IEEESpectrum,33(10):26-35.
Caulfield H J,Szu H H.1992.Parallel discrete and continuous wavelet transforms[J].Optical Eng,31(9):1835-1839.
Daubechies I.1988.Orthonormal bases of compactly supported wavelets[J].Comman On Pure and Appl Math,41:909-996.
Morlet J,Arens G,Fourgeau E,Glard D.1982.Wave propagation and sampling theory[J].Geophysics,47(1):203-211.
Mallat S.1989.Atheory of multiresolution signal decomposition:The wavelet transform[J].IEEE Trans,11(7):674-693.
吴招才,刘天佑.2008.地震数据去噪中的小波方法[J].地球物理学进展,23(2):493-499.
严尊国,陈俊华,钱家栋,李胜乐,廖武林.2000.二进小波变换在地震前兆信号频率分解中的应用[J].地震,20(S1):76-81.
周硕愚,吴云,董慧风.1990.蕴震系统信息合成方法(ISSS)[J].中国地震,6(4):35-42.
周志坚,杜爱民.2004.用小波方法分析2000年7月13日地磁扰动[J].地球物理学进展,19(4):980-983.
张雁滨,蒋骏,钱家栋,陈京,和升棋,张燕,和平.2002.地壳介质微形变异常与强震短临前兆[J].地震学报,24(12):103-108.
张燕,吴云,刘永启,褚永海,施顺英.2003.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,23(4):103-108.
张燕,吴云,刘永启,施顺英.2004.小波分析在地壳形变资料处理中的应用[J].地震学报,26(增刊):103-109.
Bruce A,Donoho D,Gao H Y.1996.Wavelet analysis[J].IEEESpectrum,33(10):26-35.
Caulfield H J,Szu H H.1992.Parallel discrete and continuous wavelet transforms[J].Optical Eng,31(9):1835-1839.
Daubechies I.1988.Orthonormal bases of compactly supported wavelets[J].Comman On Pure and Appl Math,41:909-996.
Morlet J,Arens G,Fourgeau E,Glard D.1982.Wave propagation and sampling theory[J].Geophysics,47(1):203-211.
Mallat S.1989.Atheory of multiresolution signal decomposition:The wavelet transform[J].IEEE Trans,11(7):674-693.
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