利用小波包变换时频谱识别宁夏及邻区的地震和爆破
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摘要
采用dmey小波基函数分别对地震和爆破事件的垂直向记录信号进行小波包变换,计算各事件信号的归一化时频谱值以及P波和S波时频谱值达到最大时的频率fmp和fms,比较地震信号和爆破信号P波段(0～6.25Hz)和S波段(0～6.25Hz)在各相同分解频带内的瞬时谱最大值差异,寻找合适的单项定量识别指标,并综合各单项识别指标形成综合识别判据。运用综合识别判据对银川台记录到的宁夏及邻区14个地震事件和19个爆破事件进行判别,结果表明,各单项定量识别指标的识别率均在80%以上,综合判别结果均与事件的真实类型一致。
Using dmey wavelet-base function,we conduct a wavelet-packet transform of the signals of vertical component recordings of the earthquakes and the explosions to calculate the values of the normalized time-frequency spectrum of the signal of each earthquake and explosion,and to calculate the frequency fmp on condition that the value of time-frequency spectrum of P wave is maximum.We also calculate the frequency fms on condition that the value of time-frequency spectrum of S wave is maximum.Then we compare the maximum value of instantaneous spectrum of the seismic signals with that of the blasting signals in the same decomposition frequency band of P wave within frequency 0-6.25 Hz.And we compare the maximum value of instantaneous spectrum of the seismic signals with that of the blasting signals in the same decomposition frequency band of S wave within frequency 0-6.25 Hz.Thus we get some quantitative indexes to identify the earthquake and the explosion.Combining all these indexes we get a synthetic criterion.Then we apply the single index and the synthetic criterion to the identification test of 14 quakes and 19 explosions recorded by Yinchuan Seismic Station.We find that using the single index,80% of the quakes and the explosions can be identified,and 100% of the quakes and the explosions can be identified using the synthetic criterion.
Using dmey wavelet-base function,we conduct a wavelet-packet transform of the signals of vertical component recordings of the earthquakes and the explosions to calculate the values of the normalized time-frequency spectrum of the signal of each earthquake and explosion,and to calculate the frequency fmp on condition that the value of time-frequency spectrum of P wave is maximum.We also calculate the frequency fms on condition that the value of time-frequency spectrum of S wave is maximum.Then we compare the maximum value of instantaneous spectrum of the seismic signals with that of the blasting signals in the same decomposition frequency band of P wave within frequency 0-6.25 Hz.And we compare the maximum value of instantaneous spectrum of the seismic signals with that of the blasting signals in the same decomposition frequency band of S wave within frequency 0-6.25 Hz.Thus we get some quantitative indexes to identify the earthquake and the explosion.Combining all these indexes we get a synthetic criterion.Then we apply the single index and the synthetic criterion to the identification test of 14 quakes and 19 explosions recorded by Yinchuan Seismic Station.We find that using the single index,80% of the quakes and the explosions can be identified,and 100% of the quakes and the explosions can be identified using the synthetic criterion.
引文
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曾宪伟,赵卫明,盛菊琴,等.2008.应用小波包识别宁夏及邻区的地震和爆破[J].地震研究,31(2):142-148.
P la fcan D,Sandvol E,Seber D,et al.1997.Regional discrimination ofchemical explosions and earthquakes:A case study in Morocco[J].BSSA,87(5):1126-1139.
T ay lor S R.1996.Analysis of high-frequency Pg/Lg ratios from NTS ex-plosions and western U.S.earthquakes[J].BSSA,86(4):1042-1053.
W a lter W R,Mayeda K M,Patton HJ.1995.Phase and spectral ratio dis-crimination between NTS earthquakes and explosions.Part I:Empiri-cal observations[J].BSSA,85(4):1050-1067.
K im W Y,Aharonian V,Lerner-Lam A L,et al.1997.Discrimination of earthquakes and explosions in southern Russia using regional high-frequency three-component data from the IRIS/JSP Caucasus net-work.[J].BSSA,87(3):569-588.
曹晖,赖明,白绍良.2004.地震地面运动局部谱密度的小波变换估计[J].工程力学,21(5):109-115.
陈顺云,杨润海,王赟赟,等.2006.小波分析在声发射资料处理中的初步应用[J].地震研究,25(4):328-334.
陈运泰,顾浩鼎.2004.震源理论基础(上册)[M].北京:地震出版社.
飞思科技产品研发中心.2005.小波分析理论与MATLAB7实现[M].北京:电子工业出版社.
李弼程,罗建书.2003.小波分析及其应用[M].北京:电子工业出版社.
林大超,施惠基,白春华,等.2003.爆炸地震效应的时频分析[J].爆炸与冲击,23(1):31-36.
刘希强,沈萍,张玲,等.2003.用小波变换能量线性度方法识别天然地震与爆破或塌方[J].西北地震学报,25(3):204-209.
刘希强,周惠兰,李红.2000.基于小波包变换的地震数据时频分析方法[J].西北地震学报,22(2):143-176.
沈萍,郑治真.1999.瞬态谱在地震与核爆识别中的应用[J].地球物理学报,42(2):233-240.
阳生权.2002.爆破地震累积效应理论和应用初步研究[D].长沙:中南大学.
杨选辉,沈萍,刘希强,等.2005.地震与核爆破识别的小波包分量比方法[J].地球物理学报,48(1):148-156.
曾宪伟,赵卫明,盛菊琴,等.2008.应用小波包识别宁夏及邻区的地震和爆破[J].地震研究,31(2):142-148.
P la fcan D,Sandvol E,Seber D,et al.1997.Regional discrimination ofchemical explosions and earthquakes:A case study in Morocco[J].BSSA,87(5):1126-1139.
T ay lor S R.1996.Analysis of high-frequency Pg/Lg ratios from NTS ex-plosions and western U.S.earthquakes[J].BSSA,86(4):1042-1053.
W a lter W R,Mayeda K M,Patton HJ.1995.Phase and spectral ratio dis-crimination between NTS earthquakes and explosions.Part I:Empiri-cal observations[J].BSSA,85(4):1050-1067.
K im W Y,Aharonian V,Lerner-Lam A L,et al.1997.Discrimination of earthquakes and explosions in southern Russia using regional high-frequency three-component data from the IRIS/JSP Caucasus net-work.[J].BSSA,87(3):569-588.
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