S变换在汶川地震前后应变变化分析中的应用
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摘要
引入时频分析中的S变换方法,对姑咱台四分量钻孔应变观测曲线中出现的"压性脉冲"和"潮汐畸变"异常信号进行分析。结果表明,在背景信号的基础上,周期约10～60分钟的信号在汶川地震前开始大量出现,震后逐渐衰减;能量最大的信号仍然是背景信号,其能量幅度随地震发生时间的临近而增大,震后逐渐减弱。
It is found that some abnormal signals like compressive pulses and tidal distortion of the 4-component borehole strain observation at Guza station about a year before the Wenchuan Ms8.0 earthquake in 2008 and even continued to occur occasionally after the earthquake.The S transform was tried to apple to the field in order to carry out a further research into the abnormal signal characteristic from a different perspective.An analysis of 4-component borehole strain observation from over 20 stations within 1500 kms from the Wenchuan epicenter showed that only in the observations at Guza station there were significant abnormal signals with the following characteristics: On the basis of the background signals,the signals with period of about 10 to 60 minutes increased before the Wenchuan earthquake and gradually decreased after the earthquake,meanwhile,the most powerful signals were background signals with the power enhanced before the earthquake and weakened after it.
It is found that some abnormal signals like compressive pulses and tidal distortion of the 4-component borehole strain observation at Guza station about a year before the Wenchuan Ms8.0 earthquake in 2008 and even continued to occur occasionally after the earthquake.The S transform was tried to apple to the field in order to carry out a further research into the abnormal signal characteristic from a different perspective.An analysis of 4-component borehole strain observation from over 20 stations within 1500 kms from the Wenchuan epicenter showed that only in the observations at Guza station there were significant abnormal signals with the following characteristics: On the basis of the background signals,the signals with period of about 10 to 60 minutes increased before the Wenchuan earthquake and gradually decreased after the earthquake,meanwhile,the most powerful signals were background signals with the power enhanced before the earthquake and weakened after it.
引文
1池顺良,等.从5.12汶川地震前后分量应变仪观测到的应变异常看建设密集应变观测网络的必要性[J].国际地震动态,2009,(1):1-13.(Chi Shunliang,et al.Thenecessity of building national strain-observation network fromthe strain abnormality before Wenchuan earthquake[J].Re-cent Developments in World Seismology,2009,(1):1-13)
2阳光,刘仕锦李学川.姑咱台2008年汶川8.0级地震钻孔应变观测报告[J].地壳构造与地壳应力文集,2010,(22):135-148.(Yang Guang,Liu Shijin and Li Xue-chuan.A report on borehole strain observation at Guzan sta-tion for the 8.0 Wenchuan earthquake of 2008[J].Bulletinof the Institute of Crustal Dynamics,2010(22):135-148)
3金日光.地震前兆识别与地震灾害预警[M].北京:中国地质大学出版社,2009.(Jin Riguang.Earthquake precur-sory identification and earthquake disaster early warning[M].Beijing:China University of Geosciences Press,2009)
4邱泽华,周龙寿,池顺良.用超限率分析法研究汶川地震的前兆应变变化[J].大地测量与地球动力学,2009,(4):1-9.(Qiu Zehua,Zhou Longshou and Chi Shunliang.Study on precursory strain changes of Wenchuan earthquakewith ORAmethod[J].Journal of Geodesy and Geodynamics,2009,(4):1-9)
5邱泽华,等.汶川地震前姑咱台观测的异常应变变化[J].中国科学:地球科学,2010,40(8):1 031-1 039.(Qiu Zehua,et al.Abnormal strain changes observed at Gu-za before the Wenchuan earthquake[J].Sci China EarthSci.,2010,40(8):1 031-1 039)
6张晶,刘琦.四分量式钻孔应变观测资料的处理与分析[J].大地测量与地球动力学,2010,(6):6-9.(ZhangJing and Liu Qi.Processing and analysis of four-componentborehole strain observations[J].Journal of Geodesy and Geo-dynamics,2010,(6):6-9)
7 Stockwell R G,Mansinha L and Lowe R P.Localization ofthe complex spectrum:the S transform[J].IEEE Trans.onSignal Processing,1996,44(4):998-1 001.
2阳光,刘仕锦李学川.姑咱台2008年汶川8.0级地震钻孔应变观测报告[J].地壳构造与地壳应力文集,2010,(22):135-148.(Yang Guang,Liu Shijin and Li Xue-chuan.A report on borehole strain observation at Guzan sta-tion for the 8.0 Wenchuan earthquake of 2008[J].Bulletinof the Institute of Crustal Dynamics,2010(22):135-148)
3金日光.地震前兆识别与地震灾害预警[M].北京:中国地质大学出版社,2009.(Jin Riguang.Earthquake precur-sory identification and earthquake disaster early warning[M].Beijing:China University of Geosciences Press,2009)
4邱泽华,周龙寿,池顺良.用超限率分析法研究汶川地震的前兆应变变化[J].大地测量与地球动力学,2009,(4):1-9.(Qiu Zehua,Zhou Longshou and Chi Shunliang.Study on precursory strain changes of Wenchuan earthquakewith ORAmethod[J].Journal of Geodesy and Geodynamics,2009,(4):1-9)
5邱泽华,等.汶川地震前姑咱台观测的异常应变变化[J].中国科学:地球科学,2010,40(8):1 031-1 039.(Qiu Zehua,et al.Abnormal strain changes observed at Gu-za before the Wenchuan earthquake[J].Sci China EarthSci.,2010,40(8):1 031-1 039)
6张晶,刘琦.四分量式钻孔应变观测资料的处理与分析[J].大地测量与地球动力学,2010,(6):6-9.(ZhangJing and Liu Qi.Processing and analysis of four-componentborehole strain observations[J].Journal of Geodesy and Geo-dynamics,2010,(6):6-9)
7 Stockwell R G,Mansinha L and Lowe R P.Localization ofthe complex spectrum:the S transform[J].IEEE Trans.onSignal Processing,1996,44(4):998-1 001.
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