2次爆炸事件的相关性与能量比研究

Relativity and energy ratio between two explosion events

主要对全球地震台网(GSN)牡丹江(MDJ)地震台记录的2006年10月9日与2009年5月25日爆炸事件进行分析对比研究。应用2次事件的P震相最大振幅比值和功率谱比值估计了2次事件的能量比。应用互相关值和相干函数方法计算了2次事件在时域与频域的相关性。最后得出,2009年的爆炸事件与2006年爆炸事件相比,3个方向的P震相最大单振幅比值平均为3.97,功率谱比值平均为4.5,由此估计2009年爆炸事件是2006年爆炸事件能量的4～5倍。MDJ台3个方向(Z、N、E)记录的2次事件在1～4Hz频段的互相关值平均为0.88,相干函数平均为0.8左右。

Two explosion events recorded by station MDJ on October 9,2006 and May 25,2009 were investigated,respectively.The energy ratio of the two explosion events was estimated by comparing the maximum P phase amplitudes and the power spectrum densities.Relativity of the two explosion events in time and frequency domains was determined by using the cross correlation and the coherence function.Comparison between the 2009 event and the 2006 event displays that the mean ratio of the maximum P phase amplitudes in three components is about 3.97,the mean ratio of the power spectrum densities is about 4.5.It indicates that the energy released by the 2009 explosion event is 4～5 times as much as that released by the 2006 explosion event.The mean cross correlation of the two events recorded in the three components of MDJ was about 0.88 in 1～4Hz,and the coherence values of the two events are around 0.8at the same frequency band.