基于爆炸地震波分析3次爆炸事件的主要特征
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摘要
主要分析全球地震台网牡丹江和白家疃地震台记录的2006年10月9日、2009年5月25日和2013年2月12日的3次爆炸事件。主要通过3次事件P震相振幅比和功率谱比值估计了3次事件的能量比,采用互相关方法计算了3次事件的相关系数,对比震相波形探讨3次事件发生的相对位置。2013年的爆炸事件与2009年的爆炸事件相比,三分向最大单振幅比值和功率谱比值平均分别为2.2和2.6;与2006年的爆炸事件相比,三分向P震相最大单振幅比值和功率谱比值平均分别为11.1和13.9。该结果暗示了2013年爆炸事件释放的能量高于2009年爆炸事件的2倍,高于2006年爆炸事件的10倍。在2~4Hz频段内,2013年爆炸事件与2006年爆炸事件、2009年爆炸事件三分向波形的最大相关系数平均分别为0.90和0.99。相关性分析结果表示,3次爆炸事件在能量的主要集中频段高度相关,这表明3次爆炸事件发生的位置相距很近。相对位置分析表明,2013年爆炸事件发生的位置在2009年爆炸事件发生位置的东偏南方向。
The three explosion events recorded by Mudanjiang and Baijitong sesimic stations on October 9,2006,May 25,2009 and Feburary 12,2013 were analyzed,respectively.Both the stations belong to Global Sesimic Network.The energy ratios of the three events were estimated by comparing the maximum P-phase amplitudes and the power spectrum densities,and the correlation coefficients of the three explosion events were determined.The phases were compared to determine the relative location of these explosion events.Comparison between the 2013 event and the 2009 event displays that the mean ratios of the maximum amplitudes and the power spectrum densities are about 2.3and 2.7,respectively.The results for the 2013 event and the 2006 event displays that the mean ratio of the maximum amplitudes is about 10.1and the mean ratio of the power spectrum densities is about 13.5.It indicates that the energy released by the 2013 event is about 11.8times as much as that released by the 2006 event and 2.5times as much as that released by the 2009 event.The maximum cross correlations were 0.90 and 0.99 for the 2013,2006 events and the 2013,2009 events in 2-4Hz,respectively.These results mean that the 2013 event is highly correlated to the 2006 and 2009events in the frequency band which the main energy concentrated,and this shows that the relative distances of the three events are not long.The analysis on the relative locations of these three events can explain that the 2013 event lies to the southeast of the 2009 events.
The three explosion events recorded by Mudanjiang and Baijitong sesimic stations on October 9,2006,May 25,2009 and Feburary 12,2013 were analyzed,respectively.Both the stations belong to Global Sesimic Network.The energy ratios of the three events were estimated by comparing the maximum P-phase amplitudes and the power spectrum densities,and the correlation coefficients of the three explosion events were determined.The phases were compared to determine the relative location of these explosion events.Comparison between the 2013 event and the 2009 event displays that the mean ratios of the maximum amplitudes and the power spectrum densities are about 2.3and 2.7,respectively.The results for the 2013 event and the 2006 event displays that the mean ratio of the maximum amplitudes is about 10.1and the mean ratio of the power spectrum densities is about 13.5.It indicates that the energy released by the 2013 event is about 11.8times as much as that released by the 2006 event and 2.5times as much as that released by the 2009 event.The maximum cross correlations were 0.90 and 0.99 for the 2013,2006 events and the 2013,2009 events in 2-4Hz,respectively.These results mean that the 2013 event is highly correlated to the 2006 and 2009events in the frequency band which the main energy concentrated,and this shows that the relative distances of the three events are not long.The analysis on the relative locations of these three events can explain that the 2013 event lies to the southeast of the 2009 events.
引文
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[2]USGS.Earthquakes:Search EQ archives[EB/OL].[2009-5-25].http:∥earthquake.usgs.gov/earthquakes/eqarchives/epic/
[3]USGS.Earthquakes:Search EQ archives[EB/OL].[2013-02-12].http:∥earthquake.usgs.gov/earthquakes/eqarchives/epic/
[4]Kim W Y,Richards P G.North Korean nuclear test:Seismic discrimination at low yield[J].Eos,Transactions American Geophysical Union,2007,88(13/14):157-161.
[5]范娜,赵连锋,谢小碧,等.朝鲜核爆的Rayleigh波震级测量[J].地球物理学报,2013,56(3):906-915.Fan Na,Zhao Lian-feng,Xie Xiao-bi,et al.Measurement of Rayleigh-wave magnitudes for North Korean nuclear tests[J].Chinese Journal of Geophysics,2013,56(3):906-915.
[6]胡广书.数字信号处理:理论、算法与实现[M].北京:清华大学出版社,2003:324-341.
[7]郝春月,郑重.2次爆炸事件的相关性与能量比研究[J].爆炸与冲击,2010,30(5):535-540.Hao Chun-yue,Zheng Zhong.Relativity and energy ratio between two explosion events[J].Explosion and Shock Waves,2010,30(5):535-540.
[8]时振梁,张少泉,赵荣国,等.地震工作手册[M].北京:地震出版社,1992:41-47.
[9]Kvrna T.On exploitation of small-aperture NORESS type arrays for enhanced P-wave detectability[J].Bulletin of the Seismological Society of America,1989,79(3):888-900.
[10]Mykkeltveit S,stebl K,Doornbos D J,et al.Seismic array configuration optimization[J].Bulletin of the Seismological Society of America,1983,73(1):173-186.
[11]Harjes H P.Design and siting of a new regional seismic array in Central Europe[J].Bulletin of the Seismological Society of America,1990,80(6B):1801-1817.
[12]Ingate S F,Husebye E S,Christoffersson A.Regional arrays and optimum data processing schemes[J].Bulletin of the Seismological Society of America,1985,75(4):1155-1177.
[13]彼得·鲍曼.新地震观测实践手册[M].中国地震局监测预报司,译.北京:地震出版社,2006:321-367.
[14]傅淑芳,刘宝诚,李文艺.地震学教程[M].北京:地震出版社,1980:137-153.
[15]郑州晚报数字报:A12版:国际新闻[N/OL].[2013-02-05]http:∥zzwb.zynews.com/html/2013-02/05/content_440861.htm
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